51864480 has 72 divisors (see below), whose sum is σ = 176992452. Its totient is φ = 13830144.

The previous prime is 51864469. The next prime is 51864511. The reversal of 51864480 is 8446815.

51864480 is a `hidden beast` number, since 5 + 1 + 8 + 644 + 8 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51667344 + 197136 = 7188^2 + 444^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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 11 ways as a sum of consecutive naturals, for example, 16569 + ... + 19448.

Almost surely, 2^51864480 is an apocalyptic number.

It is an amenable number.

51864480 is an abundant number, since it is smaller than the sum of its proper divisors (125127972).

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

51864480 is a wasteful number, since it uses less digits than its factorization.

51864480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36038 (or 36027 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 51864480 is about 7201.6997993529. The cubic root of 51864480 is about 372.9265836479.

The spelling of 51864480 in words is "fifty-one million, eight hundred sixty-four thousand, four hundred eighty".