51685536 has 48 divisors (see below), whose sum is σ = 155058624. Its totient is φ = 14767104.

The previous prime is 51685523. The next prime is 51685561. The reversal of 51685536 is 63558615.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 51685494 and 51685503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37785 + ... + 39128.

It is an arithmetic number, because the mean of its divisors is an integer number (3230388).

Almost surely, 2^51685536 is an apocalyptic number.

51685536 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51685536 is an abundant number, since it is smaller than the sum of its proper divisors (103373088).

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

51685536 is a wasteful number, since it uses less digits than its factorization.

51685536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76933 (or 76925 counting only the distinct ones).

The product of its digits is 108000, while the sum is 39.

The square root of 51685536 is about 7189.2653310335. The cubic root of 51685536 is about 372.4971962013.

The spelling of 51685536 in words is "fifty-one million, six hundred eighty-five thousand, five hundred thirty-six".