55721376 has 144 divisors (see below), whose sum is σ = 176904000. Its totient is φ = 16533504.

The previous prime is 55721363. The next prime is 55721399. The reversal of 55721376 is 67312755.

55721376 is a `hidden beast` number, since 5 + 572 + 13 + 76 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a self number, because there is not a number n which added to its sum of digits gives 55721376.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92725 + ... + 93323.

It is an arithmetic number, because the mean of its divisors is an integer number (1228500).

Almost surely, 2^55721376 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 55721376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88452000).

55721376 is an abundant number, since it is smaller than the sum of its proper divisors (121182624).

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

55721376 is a wasteful number, since it uses less digits than its factorization.

55721376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651 (or 640 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 55721376 is about 7464.6752106170. The cubic root of 55721376 is about 381.9506711519.

The spelling of 55721376 in words is "fifty-five million, seven hundred twenty-one thousand, three hundred seventy-six".