55728757917 has 40 divisors (see below), whose sum is σ = 95290454336. Its totient is φ = 31795270848.

The previous prime is 55728757901. The next prime is 55728757919. The reversal of 55728757917 is 71975782755.

55728757917 is a `hidden beast` number, since 5 + 57 + 2 + 8 + 7 + 579 + 1 + 7 = 666.

It is not a de Polignac number, because 55728757917 - 2⁴ = 55728757901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55728757919) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 288153 + ... + 441009.

Almost surely, 2^55728757917 is an apocalyptic number.

It is an amenable number.

55728757917 is a deficient number, since it is larger than the sum of its proper divisors (39561696419).

55728757917 is a wasteful number, since it uses less digits than its factorization.

55728757917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153519 (or 153510 counting only the distinct ones).

The product of its digits is 43218000, while the sum is 63.

The spelling of 55728757917 in words is "fifty-five billion, seven hundred twenty-eight million, seven hundred fifty-seven thousand, nine hundred seventeen".