51655780 has 24 divisors (see below), whose sum is σ = 118339200. Its totient is φ = 18783840.

The previous prime is 51655763. The next prime is 51655817. The reversal of 51655780 is 8755615.

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, 117180 + ... + 117619.

It is an arithmetic number, because the mean of its divisors is an integer number (4930800).

Almost surely, 2^51655780 is an apocalyptic number.

It is an amenable number.

51655780 is an abundant number, since it is smaller than the sum of its proper divisors (66683420).

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

51655780 is a wasteful number, since it uses less digits than its factorization.

51655780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234819 (or 234817 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 37.

The square root of 51655780 is about 7187.1955587698. The cubic root of 51655780 is about 372.4256987368.

The spelling of 51655780 in words is "fifty-one million, six hundred fifty-five thousand, seven hundred eighty".