55620216 has 32 divisors (see below), whose sum is σ = 154501200. Its totient is φ = 18540000.

The previous prime is 55620203. The next prime is 55620263. The reversal of 55620216 is 61202655.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 55620216.

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, 128535 + ... + 128966.

Almost surely, 2^55620216 is an apocalyptic number.

It is an amenable number.

55620216 is an abundant number, since it is smaller than the sum of its proper divisors (98880984).

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

55620216 is a wasteful number, since it uses less digits than its factorization.

55620216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257516 (or 257506 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 55620216 is about 7457.8962181033. The cubic root of 55620216 is about 381.7193922527.

The spelling of 55620216 in words is "fifty-five million, six hundred twenty thousand, two hundred sixteen".