44648721 has 24 divisors (see below), whose sum is σ = 69765696. Its totient is φ = 27352800.

The previous prime is 44648717. The next prime is 44648741. The reversal of 44648721 is 12784644.

44648721 is a `hidden beast` number, since 4 + 4 + 648 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 44648721 - 2² = 44648717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (44648701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30046 + ... + 31496.

It is an arithmetic number, because the mean of its divisors is an integer number (2906904).

Almost surely, 2^44648721 is an apocalyptic number.

It is an amenable number.

44648721 is a deficient number, since it is larger than the sum of its proper divisors (25116975).

44648721 is a wasteful number, since it uses less digits than its factorization.

44648721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733 (or 1730 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 44648721 is about 6681.9698442899. The cubic root of 44648721 is about 354.7613843158.

It can be divided in two parts, 44648 and 721, that added together give a square (45369 = 213²).

The spelling of 44648721 in words is "forty-four million, six hundred forty-eight thousand, seven hundred twenty-one".