55891878 has 32 divisors (see below), whose sum is σ = 128957184. Its totient is φ = 15818592.

The previous prime is 55891877. The next prime is 55891879. The reversal of 55891878 is 87819855.

It is an interprime number because it is at equal distance from previous prime (55891877) and next prime (55891879).

It is a self number, because there is not a number n which added to its sum of digits gives 55891878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55891877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1725 + ... + 10712.

It is an arithmetic number, because the mean of its divisors is an integer number (4029912).

Almost surely, 2^55891878 is an apocalyptic number.

55891878 is an abundant number, since it is smaller than the sum of its proper divisors (73065306).

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

55891878 is a wasteful number, since it uses less digits than its factorization.

55891878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12556.

The product of its digits is 806400, while the sum is 51.

The square root of 55891878 is about 7476.0870781446. The cubic root of 55891878 is about 382.3398517918.

The spelling of 55891878 in words is "fifty-five million, eight hundred ninety-one thousand, eight hundred seventy-eight".