44257721 has 4 divisors (see below), whose sum is σ = 44918352. Its totient is φ = 43597092.

The previous prime is 44257699. The next prime is 44257723. The reversal of 44257721 is 12775244.

44257721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 44257721 - 2⁶ = 44257657 is a prime.

It is a super-2 number, since 2×44257721² = 3917491736227682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (44257723) 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, 330215 + ... + 330348.

It is an arithmetic number, because the mean of its divisors is an integer number (11229588).

Almost surely, 2^44257721 is an apocalyptic number.

It is an amenable number.

44257721 is a deficient number, since it is larger than the sum of its proper divisors (660631).

44257721 is an equidigital number, since it uses as much as digits as its factorization.

44257721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660630.

The product of its digits is 15680, while the sum is 32.

The square root of 44257721 is about 6652.6476684099. The cubic root of 44257721 is about 353.7227685714.

The spelling of 44257721 in words is "forty-four million, two hundred fifty-seven thousand, seven hundred twenty-one".