55403878 has 16 divisors (see below), whose sum is σ = 84347424. Its totient is φ = 27290880.

The previous prime is 55403857. The next prime is 55403879. The reversal of 55403878 is 87830455.

It is a self number, because there is not a number n which added to its sum of digits gives 55403878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55403879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53223 + ... + 54253.

It is an arithmetic number, because the mean of its divisors is an integer number (5271714).

Almost surely, 2^55403878 is an apocalyptic number.

55403878 is a deficient number, since it is larger than the sum of its proper divisors (28943546).

55403878 is a wasteful number, since it uses less digits than its factorization.

55403878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407.

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 55403878 is about 7443.3781309295. The cubic root of 55403878 is about 381.2238427633.

The spelling of 55403878 in words is "fifty-five million, four hundred three thousand, eight hundred seventy-eight".