55216686 has 32 divisors (see below), whose sum is σ = 126604800. Its totient is φ = 15726816.

The previous prime is 55216649. The next prime is 55216741. The reversal of 55216686 is 68661255.

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, 12775 + ... + 16541.

It is an arithmetic number, because the mean of its divisors is an integer number (3956400).

Almost surely, 2^55216686 is an apocalyptic number.

55216686 is an abundant number, since it is smaller than the sum of its proper divisors (71388114).

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

55216686 is a wasteful number, since it uses less digits than its factorization.

55216686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4128.

The product of its digits is 86400, while the sum is 39.

The square root of 55216686 is about 7430.7930936072. The cubic root of 55216686 is about 380.7940137982.

The spelling of 55216686 in words is "fifty-five million, two hundred sixteen thousand, six hundred eighty-six".