51501872 has 20 divisors (see below), whose sum is σ = 100450416. Its totient is φ = 25579200.

The previous prime is 51501869. The next prime is 51501887. The reversal of 51501872 is 27810515.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

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, 8243 + ... + 13074.

Almost surely, 2^51501872 is an apocalyptic number.

It is an amenable number.

51501872 is a deficient number, since it is larger than the sum of its proper divisors (48948544).

51501872 is a wasteful number, since it uses less digits than its factorization.

51501872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21476 (or 21470 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 51501872 is about 7176.4804744387. The cubic root of 51501872 is about 372.0554509393.

The spelling of 51501872 in words is "fifty-one million, five hundred one thousand, eight hundred seventy-two".