55578879 has 20 divisors (see below), whose sum is σ = 86637936. Its totient is φ = 35440416.

The previous prime is 55578851. The next prime is 55578889. The reversal of 55578879 is 97887555.

55578879 is a `hidden beast` number, since 5 + 557 + 8 + 87 + 9 = 666.

55578879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55578879 - 2²⁴ = 38801663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55578889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13054 + ... + 16779.

Almost surely, 2^55578879 is an apocalyptic number.

55578879 is a deficient number, since it is larger than the sum of its proper divisors (31059057).

55578879 is a wasteful number, since it uses less digits than its factorization.

55578879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29868 (or 29859 counting only the distinct ones).

The product of its digits is 3528000, while the sum is 54.

The square root of 55578879 is about 7455.1243450395. The cubic root of 55578879 is about 381.6248040718.

The spelling of 55578879 in words is "fifty-five million, five hundred seventy-eight thousand, eight hundred seventy-nine".