44645721 has 4 divisors (see below), whose sum is σ = 59527632. Its totient is φ = 29763812.

The previous prime is 44645719. The next prime is 44645729. The reversal of 44645721 is 12754644.

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 44645721 - 2¹ = 44645719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (44645729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7440951 + ... + 7440956.

It is an arithmetic number, because the mean of its divisors is an integer number (14881908).

Almost surely, 2^44645721 is an apocalyptic number.

It is an amenable number.

44645721 is a deficient number, since it is larger than the sum of its proper divisors (14881911).

44645721 is a wasteful number, since it uses less digits than its factorization.

44645721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14881910.

The product of its digits is 26880, while the sum is 33.

The square root of 44645721 is about 6681.7453558183. The cubic root of 44645721 is about 354.7534385265.

The spelling of 44645721 in words is "forty-four million, six hundred forty-five thousand, seven hundred twenty-one".