51468840 has 48 divisors (see below), whose sum is σ = 167274900. Its totient is φ = 13724928.

The previous prime is 51468829. The next prime is 51468841. The reversal of 51468840 is 4886415.

51468840 is a `hidden beast` number, since 514 + 68 + 84 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 44275716 + 7193124 = 6654^2 + 2682^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 51468795 and 51468804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51468841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71125 + ... + 71844.

Almost surely, 2^51468840 is an apocalyptic number.

It is an amenable number.

51468840 is an abundant number, since it is smaller than the sum of its proper divisors (115806060).

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

51468840 is a wasteful number, since it uses less digits than its factorization.

51468840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142986 (or 142979 counting only the distinct ones).

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

The square root of 51468840 is about 7174.1786986386. The cubic root of 51468840 is about 371.9758916045.

The spelling of 51468840 in words is "fifty-one million, four hundred sixty-eight thousand, eight hundred forty".