55722816 has 84 divisors (see below), whose sum is σ = 165681152. Its totient is φ = 18569088.

The previous prime is 55722791. The next prime is 55722827. The reversal of 55722816 is 61822755.

It is a happy number.

55722816 is a `hidden beast` number, since 5 + 572 + 2 + 81 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13761 + ... + 17343.

Almost surely, 2^55722816 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 55722816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82840576).

55722816 is an abundant number, since it is smaller than the sum of its proper divisors (109958336).

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

55722816 is an equidigital number, since it uses as much as digits as its factorization.

55722816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610 (or 3588 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 55722816 is about 7464.7716642909. The cubic root of 55722816 is about 381.9539613568.

The spelling of 55722816 in words is "fifty-five million, seven hundred twenty-two thousand, eight hundred sixteen".