55198390 has 32 divisors (see below), whose sum is σ = 111658176. Its totient is φ = 19493760.

The previous prime is 55198379. The next prime is 55198417. The reversal of 55198390 is 9389155.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6241 + ... + 12220.

It is an arithmetic number, because the mean of its divisors is an integer number (3489318).

Almost surely, 2^55198390 is an apocalyptic number.

55198390 is an abundant number, since it is smaller than the sum of its proper divisors (56459786).

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

55198390 is a wasteful number, since it uses less digits than its factorization.

55198390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18504.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 55198390 is about 7429.5618982548. The cubic root of 55198390 is about 380.7519505656.

The spelling of 55198390 in words is "fifty-five million, one hundred ninety-eight thousand, three hundred ninety".