51665736 has 16 divisors (see below), whose sum is σ = 129164400. Its totient is φ = 17221904.

The previous prime is 51665723. The next prime is 51665741. The reversal of 51665736 is 63756615.

It is a junction number, because it is equal to n+sod(n) for n = 51665694 and 51665703.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076346 + ... + 1076393.

It is an arithmetic number, because the mean of its divisors is an integer number (8072775).

Almost surely, 2^51665736 is an apocalyptic number.

It is an amenable number.

51665736 is an abundant number, since it is smaller than the sum of its proper divisors (77498664).

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

51665736 is a wasteful number, since it uses less digits than its factorization.

51665736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152748 (or 2152744 counting only the distinct ones).

The product of its digits is 113400, while the sum is 39.

The square root of 51665736 is about 7187.8881460412. Note that the first 3 decimals coincide. The cubic root of 51665736 is about 372.4496239850.

The spelling of 51665736 in words is "fifty-one million, six hundred sixty-five thousand, seven hundred thirty-six".