51704840 has 32 divisors (see below), whose sum is σ = 126912960. Its totient is φ = 18801600.

The previous prime is 51704819. The next prime is 51704911. The reversal of 51704840 is 4840715.

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 7 ways as a sum of consecutive naturals, for example, 58316 + ... + 59195.

It is an arithmetic number, because the mean of its divisors is an integer number (3966030).

Almost surely, 2^51704840 is an apocalyptic number.

It is an amenable number.

51704840 is an abundant number, since it is smaller than the sum of its proper divisors (75208120).

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

51704840 is a wasteful number, since it uses less digits than its factorization.

51704840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117533 (or 117529 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 51704840 is about 7190.6077629085. The cubic root of 51704840 is about 372.5435650142.

The spelling of 51704840 in words is "fifty-one million, seven hundred four thousand, eight hundred forty".