51645432 has 32 divisors (see below), whose sum is σ = 129289680. Its totient is φ = 17191680.

The previous prime is 51645431. The next prime is 51645469. The reversal of 51645432 is 23454615.

51645432 is an esthetic number in base 5, because in such base its adjacent digits differ by 1.

It is a self number, because there is not a number n which added to its sum of digits gives 51645432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51645431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34132 + ... + 35612.

Almost surely, 2^51645432 is an apocalyptic number.

It is an amenable number.

51645432 is an abundant number, since it is smaller than the sum of its proper divisors (77644248).

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

51645432 is a wasteful number, since it uses less digits than its factorization.

51645432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2943 (or 2939 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

The square root of 51645432 is about 7186.4756313509. The cubic root of 51645432 is about 372.4008282157.

The spelling of 51645432 in words is "fifty-one million, six hundred forty-five thousand, four hundred thirty-two".