28828637656 has 192 divisors, whose sum is σ = 69349392000. Its totient is φ = 11133158400.

The previous prime is 28828637633. The next prime is 28828637671. The reversal of 28828637656 is 65673682882.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28828637594 and 28828637603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40660630 + ... + 40661338.

It is an arithmetic number, because the mean of its divisors is an integer number (361194750).

Almost surely, 2^28828637656 is an apocalyptic number.

28828637656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28828637656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34674696000).

28828637656 is an abundant number, since it is smaller than the sum of its proper divisors (40520754344).

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

28828637656 is a wasteful number, since it uses less digits than its factorization.

28828637656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922 (or 911 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 61.

The spelling of 28828637656 in words is "twenty-eight billion, eight hundred twenty-eight million, six hundred thirty-seven thousand, six hundred fifty-six".