55621716 has 12 divisors (see below), whose sum is σ = 129784032. Its totient is φ = 18540568.

The previous prime is 55621711. The next prime is 55621733. The reversal of 55621716 is 61712655.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55621711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2317560 + ... + 2317583.

It is an arithmetic number, because the mean of its divisors is an integer number (10815336).

Almost surely, 2^55621716 is an apocalyptic number.

It is an amenable number.

55621716 is an abundant number, since it is smaller than the sum of its proper divisors (74162316).

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

55621716 is a wasteful number, since it uses less digits than its factorization.

55621716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4635150 (or 4635148 counting only the distinct ones).

The product of its digits is 12600, while the sum is 33.

The square root of 55621716 is about 7457.9967819784. The cubic root of 55621716 is about 381.7228237025.

The spelling of 55621716 in words is "fifty-five million, six hundred twenty-one thousand, seven hundred sixteen".