55721610 has 96 divisors (see below), whose sum is σ = 166712832. Its totient is φ = 12648960.

The previous prime is 55721579. The next prime is 55721629. The reversal of 55721610 is 1612755.

55721610 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 151647 + ... + 152013.

It is an arithmetic number, because the mean of its divisors is an integer number (1736592).

Almost surely, 2^55721610 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55721610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83356416).

55721610 is an abundant number, since it is smaller than the sum of its proper divisors (110991222).

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

55721610 is a wasteful number, since it uses less digits than its factorization.

55721610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 55721610 is about 7464.6908844238. The cubic root of 55721610 is about 381.9512058141.

The spelling of 55721610 in words is "fifty-five million, seven hundred twenty-one thousand, six hundred ten".