55917777828 has 24 divisors (see below), whose sum is σ = 142336162080. Its totient is φ = 16944781120.

The previous prime is 55917777793. The next prime is 55917777847. The reversal of 55917777828 is 82877771955.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211809633 + ... + 211809896.

It is an arithmetic number, because the mean of its divisors is an integer number (5930673420).

Almost surely, 2^55917777828 is an apocalyptic number.

It is an amenable number.

55917777828 is an abundant number, since it is smaller than the sum of its proper divisors (86418384252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55917777828 is a wasteful number, since it uses less digits than its factorization.

55917777828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423619547 (or 423619545 counting only the distinct ones).

The product of its digits is 69148800, while the sum is 66.

The spelling of 55917777828 in words is "fifty-five billion, nine hundred seventeen million, seven hundred seventy-seven thousand, eight hundred twenty-eight".