51507756 has 36 divisors (see below), whose sum is σ = 137860632. Its totient is φ = 16159104.

The previous prime is 51507751. The next prime is 51507769. The reversal of 51507756 is 65770515.

It is a tau number, because it is divible by the number of its divisors (36).

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 51507756.

It is not an unprimeable number, because it can be changed into a prime (51507751) 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, 41470 + ... + 42693.

It is an arithmetic number, because the mean of its divisors is an integer number (3829462).

Almost surely, 2^51507756 is an apocalyptic number.

It is an amenable number.

51507756 is an abundant number, since it is smaller than the sum of its proper divisors (86352876).

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

51507756 is a wasteful number, since it uses less digits than its factorization.

51507756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84190 (or 84185 counting only the distinct ones).

The product of its (nonzero) digits is 36750, while the sum is 36.

The square root of 51507756 is about 7176.8904129853. The cubic root of 51507756 is about 372.0696192975.

The spelling of 51507756 in words is "fifty-one million, five hundred seven thousand, seven hundred fifty-six".