55815128 has 16 divisors (see below), whose sum is σ = 108029760. Its totient is φ = 27007200.

The previous prime is 55815127. The next prime is 55815139. The reversal of 55815128 is 82151855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55815127) 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, 112283 + ... + 112778.

It is an arithmetic number, because the mean of its divisors is an integer number (6751860).

Almost surely, 2^55815128 is an apocalyptic number.

It is an amenable number.

55815128 is a deficient number, since it is larger than the sum of its proper divisors (52214632).

55815128 is a wasteful number, since it uses less digits than its factorization.

55815128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225098 (or 225094 counting only the distinct ones).

The product of its digits is 16000, while the sum is 35.

The square root of 55815128 is about 7470.9522820053. The cubic root of 55815128 is about 382.1647635870.

The spelling of 55815128 in words is "fifty-five million, eight hundred fifteen thousand, one hundred twenty-eight".