44657721 has 6 divisors (see below), whose sum is σ = 64505610. Its totient is φ = 29771808.

The previous prime is 44657707. The next prime is 44657729. The reversal of 44657721 is 12775644.

44657721 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 only one way, i.e., 33767721 + 10890000 = 5811^2 + 3300^2 .

It is not a de Polignac number, because 44657721 - 2⁵ = 44657689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (44657729) 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 5 ways as a sum of consecutive naturals, for example, 2480976 + ... + 2480993.

It is an arithmetic number, because the mean of its divisors is an integer number (10750935).

Almost surely, 2^44657721 is an apocalyptic number.

It is an amenable number.

44657721 is a deficient number, since it is larger than the sum of its proper divisors (19847889).

44657721 is a wasteful number, since it uses less digits than its factorization.

44657721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4961975 (or 4961972 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 44657721 is about 6682.6432644576. The cubic root of 44657721 is about 354.7852195484.

The spelling of 44657721 in words is "forty-four million, six hundred fifty-seven thousand, seven hundred twenty-one".