55307128 has 16 divisors (see below), whose sum is σ = 103832280. Its totient is φ = 27618528.

The previous prime is 55307107. The next prime is 55307167. The reversal of 55307128 is 82170355.

It is a super-3 number, since 3×55307128³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55307128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3075 + ... + 10957.

Almost surely, 2^55307128 is an apocalyptic number.

It is an amenable number.

55307128 is a deficient number, since it is larger than the sum of its proper divisors (48525152).

55307128 is a wasteful number, since it uses less digits than its factorization.

55307128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8766 (or 8762 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 55307128 is about 7436.8762259433. The cubic root of 55307128 is about 381.0018071802.

The spelling of 55307128 in words is "fifty-five million, three hundred seven thousand, one hundred twenty-eight".