55215128 has 8 divisors (see below), whose sum is σ = 103528380. Its totient is φ = 27607560.

The previous prime is 55215119. The next prime is 55215161. The reversal of 55215128 is 82151255.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 55215128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3450938 + ... + 3450953.

Almost surely, 2^55215128 is an apocalyptic number.

It is an amenable number.

55215128 is a deficient number, since it is larger than the sum of its proper divisors (48313252).

55215128 is a wasteful number, since it uses less digits than its factorization.

55215128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6901897 (or 6901893 counting only the distinct ones).

The product of its digits is 4000, while the sum is 29.

The square root of 55215128 is about 7430.6882588358. The cubic root of 55215128 is about 380.7904322561.

The spelling of 55215128 in words is "fifty-five million, two hundred fifteen thousand, one hundred twenty-eight".