744646521 has 16 divisors (see below), whose sum is σ = 1014902784. Its totient is φ = 485429904.

The previous prime is 744646457. The next prime is 744646541. The reversal of 744646521 is 125646447.

It is not a de Polignac number, because 744646521 - 2⁶ = 744646457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 744646521.

It is not an unprimeable number, because it can be changed into a prime (744646541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244816 + ... + 247838.

It is an arithmetic number, because the mean of its divisors is an integer number (63431424).

Almost surely, 2^744646521 is an apocalyptic number.

It is an amenable number.

744646521 is a deficient number, since it is larger than the sum of its proper divisors (270256263).

744646521 is a wasteful number, since it uses less digits than its factorization.

744646521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4820.

The product of its digits is 161280, while the sum is 39.

The square root of 744646521 is about 27288.2121253848. The cubic root of 744646521 is about 906.3933730771.

The spelling of 744646521 in words is "seven hundred forty-four million, six hundred forty-six thousand, five hundred twenty-one".