744535521 has 12 divisors (see below), whose sum is σ = 1081014948. Its totient is φ = 493784064.

The previous prime is 744535499. The next prime is 744535529. The reversal of 744535521 is 125535447.

744535521 is a `hidden beast` number, since 74 + 4 + 535 + 52 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 92448225 + 652087296 = 9615^2 + 25536^2 .

It is not a de Polignac number, because 744535521 - 2⁶ = 744535457 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (744535529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 212580 + ... + 216053.

It is an arithmetic number, because the mean of its divisors is an integer number (90084579).

Almost surely, 2^744535521 is an apocalyptic number.

It is an amenable number.

744535521 is a deficient number, since it is larger than the sum of its proper divisors (336479427).

744535521 is a wasteful number, since it uses less digits than its factorization.

744535521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428832 (or 428829 counting only the distinct ones).

The product of its digits is 84000, while the sum is 36.

The square root of 744535521 is about 27286.1782043583. The cubic root of 744535521 is about 906.3483339607.

The spelling of 744535521 in words is "seven hundred forty-four million, five hundred thirty-five thousand, five hundred twenty-one".