55218878 has 16 divisors (see below), whose sum is σ = 97309296. Its totient is φ = 23168640.

The previous prime is 55218869. The next prime is 55218881. The reversal of 55218878 is 87881255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96251 + ... + 96822.

It is an arithmetic number, because the mean of its divisors is an integer number (6081831).

Almost surely, 2^55218878 is an apocalyptic number.

55218878 is a deficient number, since it is larger than the sum of its proper divisors (42090418).

55218878 is a wasteful number, since it uses less digits than its factorization.

55218878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193099.

The product of its digits is 179200, while the sum is 44.

The square root of 55218878 is about 7430.9405864937. The cubic root of 55218878 is about 380.7990526702.

The spelling of 55218878 in words is "fifty-five million, two hundred eighteen thousand, eight hundred seventy-eight".