55721672 has 16 divisors (see below), whose sum is σ = 105438300. Its totient is φ = 27604800.

The previous prime is 55721671. The next prime is 55721693. The reversal of 55721672 is 27612755.

It is a happy number.

55721672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 48246916 + 7474756 = 6946^2 + 2734^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (55721671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31079 + ... + 32822.

Almost surely, 2^55721672 is an apocalyptic number.

It is an amenable number.

55721672 is a deficient number, since it is larger than the sum of its proper divisors (49716628).

55721672 is a wasteful number, since it uses less digits than its factorization.

55721672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64016 (or 64012 counting only the distinct ones).

The product of its digits is 29400, while the sum is 35.

The square root of 55721672 is about 7464.6950373073. The cubic root of 55721672 is about 381.9513474764.

The spelling of 55721672 in words is "fifty-five million, seven hundred twenty-one thousand, six hundred seventy-two".