51438432 has 48 divisors (see below), whose sum is σ = 135475200. Its totient is φ = 17089152.

The previous prime is 51438407. The next prime is 51438451. The reversal of 51438432 is 23483415.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 51438432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36069 + ... + 37467.

It is an arithmetic number, because the mean of its divisors is an integer number (2822400).

Almost surely, 2^51438432 is an apocalyptic number.

It is an amenable number.

51438432 is an abundant number, since it is smaller than the sum of its proper divisors (84036768).

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

51438432 is a wasteful number, since it uses less digits than its factorization.

51438432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795 (or 1787 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 51438432 is about 7172.0591185517. The cubic root of 51438432 is about 371.9026222168.

The spelling of 51438432 in words is "fifty-one million, four hundred thirty-eight thousand, four hundred thirty-two".