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51988860 = 22325711331
BaseRepresentation
bin1100011001010…
…0100101111100
310121211022022100
43012110211330
5101302120420
65054145100
71200620010
oct306244574
9117738270
1051988860
112738a000
12154b2190
13aa03751
146c94540
15486e190
hex319497c

51988860 has 288 divisors, whose sum is σ = 204632064. Its totient is φ = 10454400.

The previous prime is 51988837. The next prime is 51988879. The reversal of 51988860 is 6888915.

51988860 = T464 + T465 + ... + T743.

51988860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1677045 + ... + 1677075.

It is an arithmetic number, because the mean of its divisors is an integer number (710528).

Almost surely, 251988860 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 51988860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102316032).

51988860 is an abundant number, since it is smaller than the sum of its proper divisors (152643204).

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

51988860 is a wasteful number, since it uses less digits than its factorization.

51988860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 51988860 is about 7210.3300895313. The cubic root of 51988860 is about 373.2244598203.

The spelling of 51988860 in words is "fifty-one million, nine hundred eighty-eight thousand, eight hundred sixty".