55128712 has 32 divisors (see below), whose sum is σ = 105177600. Its totient is φ = 27086400.

The previous prime is 55128679. The next prime is 55128721. The reversal of 55128712 is 21782155.

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, 166387 + ... + 166717.

It is an arithmetic number, because the mean of its divisors is an integer number (3286800).

Almost surely, 2^55128712 is an apocalyptic number.

It is an amenable number.

55128712 is a deficient number, since it is larger than the sum of its proper divisors (50048888).

55128712 is a wasteful number, since it uses less digits than its factorization.

55128712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637 (or 633 counting only the distinct ones).

The product of its digits is 5600, while the sum is 31.

The square root of 55128712 is about 7424.8711773337. The cubic root of 55128712 is about 380.5916729115.

The spelling of 55128712 in words is "fifty-five million, one hundred twenty-eight thousand, seven hundred twelve".