55217998 has 16 divisors (see below), whose sum is σ = 91503360. Its totient is φ = 24780600.

The previous prime is 55217959. The next prime is 55218019. The reversal of 55217998 is 89971255.

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, 14148 + ... + 17623.

It is an arithmetic number, because the mean of its divisors is an integer number (5718960).

Almost surely, 2^55217998 is an apocalyptic number.

55217998 is a deficient number, since it is larger than the sum of its proper divisors (36285362).

55217998 is a wasteful number, since it uses less digits than its factorization.

55217998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31863.

The product of its digits is 226800, while the sum is 46.

The square root of 55217998 is about 7430.8813743728. The cubic root of 55217998 is about 380.7970297814.

The spelling of 55217998 in words is "fifty-five million, two hundred seventeen thousand, nine hundred ninety-eight".