55197660 has 96 divisors (see below), whose sum is σ = 185955840. Its totient is φ = 11950848.

The previous prime is 55197617. The next prime is 55197671. The reversal of 55197660 is 6679155.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4522 + ... + 11438.

It is an arithmetic number, because the mean of its divisors is an integer number (1937040).

Almost surely, 2^55197660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55197660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92977920).

55197660 is an abundant number, since it is smaller than the sum of its proper divisors (130758180).

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

55197660 is a wasteful number, since it uses less digits than its factorization.

55197660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6955 (or 6953 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 55197660 is about 7429.5127700274. The cubic root of 55197660 is about 380.7502720737.

The spelling of 55197660 in words is "fifty-five million, one hundred ninety-seven thousand, six hundred sixty".