51665232 has 20 divisors (see below), whose sum is σ = 133468640. Its totient is φ = 17221728.

The previous prime is 51665219. The next prime is 51665279. The reversal of 51665232 is 23256615.

It is a super-2 number, since 2×51665232² = 5338592395227648, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51665232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538132 + ... + 538227.

It is an arithmetic number, because the mean of its divisors is an integer number (6673432).

Almost surely, 2^51665232 is an apocalyptic number.

It is an amenable number.

51665232 is an abundant number, since it is smaller than the sum of its proper divisors (81803408).

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

51665232 is a wasteful number, since it uses less digits than its factorization.

51665232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076370 (or 1076364 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 51665232 is about 7187.8530869794. The cubic root of 51665232 is about 372.4484128972.

The spelling of 51665232 in words is "fifty-one million, six hundred sixty-five thousand, two hundred thirty-two".