51685056 has 84 divisors (see below), whose sum is σ = 150676864. Its totient is φ = 16934400.

The previous prime is 51685043. The next prime is 51685057. The reversal of 51685056 is 65058615.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51685056.

It is not an unprimeable number, because it can be changed into a prime (51685057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34401 + ... + 35871.

Almost surely, 2^51685056 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 51685056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75338432).

51685056 is an abundant number, since it is smaller than the sum of its proper divisors (98991808).

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

51685056 is a wasteful number, since it uses less digits than its factorization.

51685056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550 (or 1537 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 51685056 is about 7189.2319478509. The cubic root of 51685056 is about 372.4960430791.

The spelling of 51685056 in words is "fifty-one million, six hundred eighty-five thousand, fifty-six".