55578831 has 32 divisors (see below), whose sum is σ = 97832448. Its totient is φ = 27171840.

The previous prime is 55578827. The next prime is 55578851. The reversal of 55578831 is 13887555.

It is a happy number.

It is not a de Polignac number, because 55578831 - 2² = 55578827 is a prime.

It is a super-2 number, since 2×55578831² = 6178012910653122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55578851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3150 + ... + 11003.

It is an arithmetic number, because the mean of its divisors is an integer number (3057264).

Almost surely, 2^55578831 is an apocalyptic number.

55578831 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

55578831 is a deficient number, since it is larger than the sum of its proper divisors (42253617).

55578831 is a wasteful number, since it uses less digits than its factorization.

55578831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14191.

The product of its digits is 168000, while the sum is 42.

The square root of 55578831 is about 7455.1211257766. The cubic root of 55578831 is about 381.6246942100.

The spelling of 55578831 in words is "fifty-five million, five hundred seventy-eight thousand, eight hundred thirty-one".