51539472 has 30 divisors (see below), whose sum is σ = 144239342. Its totient is φ = 17179776.

The previous prime is 51539443. The next prime is 51539491. The reversal of 51539472 is 27493515.

51539472 is a `hidden beast` number, since 51 + 539 + 4 + 72 = 666.

It can be written as a sum of positive squares in only one way, i.e., 47279376 + 4260096 = 6876^2 + 2064^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 178813 + ... + 179100.

Almost surely, 2^51539472 is an apocalyptic number.

It is an amenable number.

51539472 is an abundant number, since it is smaller than the sum of its proper divisors (92699870).

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

51539472 is a wasteful number, since it uses less digits than its factorization.

51539472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357927 (or 357918 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 51539472 is about 7179.0996649998. The cubic root of 51539472 is about 372.1459711567.

The spelling of 51539472 in words is "fifty-one million, five hundred thirty-nine thousand, four hundred seventy-two".