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28872478512768 = 27311157311139991
BaseRepresentation
bin1101001000010011001011…
…10100110101011010000000
310210020011220200002120201110
412210021211310311122000
512241021313444402033
6141223500012403320
76036652635026442
oct644114564653200
9123204820076643
1028872478512768
1192218274643a0
1232a381a776540
131315880916cb7
1471b614ad4492
1535108d0d3363
hex1a4265d35680

28872478512768 has 256 divisors, whose sum is σ = 84468798535680. Its totient is φ = 8665492992000.

The previous prime is 28872478512749. The next prime is 28872478512791. The reversal of 28872478512768 is 86721587427882.

It is a super-2 number, since 2×288724785127682 (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28872478512768.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206175253 + ... + 206315243.

It is an arithmetic number, because the mean of its divisors is an integer number (329956244280).

Almost surely, 228872478512768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28872478512768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42234399267840).

28872478512768 is an abundant number, since it is smaller than the sum of its proper divisors (55596320022912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28872478512768 is a wasteful number, since it uses less digits than its factorization.

28872478512768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140487 (or 140475 counting only the distinct ones).

The product of its digits is 1348730880, while the sum is 75.

The spelling of 28872478512768 in words is "twenty-eight trillion, eight hundred seventy-two billion, four hundred seventy-eight million, five hundred twelve thousand, seven hundred sixty-eight".