55515128 has 16 divisors (see below), whose sum is σ = 105645480. Its totient is φ = 27343008.

The previous prime is 55515127. The next prime is 55515139. The reversal of 55515128 is 82151555.

It is a junction number, because it is equal to n+sod(n) for n = 55515094 and 55515103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55515121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51251 + ... + 52322.

Almost surely, 2^55515128 is an apocalyptic number.

It is an amenable number.

55515128 is a deficient number, since it is larger than the sum of its proper divisors (50130352).

55515128 is a wasteful number, since it uses less digits than its factorization.

55515128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103646 (or 103642 counting only the distinct ones).

The product of its digits is 10000, while the sum is 32.

The square root of 55515128 is about 7450.8474685770. The cubic root of 55515128 is about 381.4788357272.

The spelling of 55515128 in words is "fifty-five million, five hundred fifteen thousand, one hundred twenty-eight".