721352664 has 48 divisors (see below), whose sum is σ = 1956492720. Its totient is φ = 240102720.

The previous prime is 721352627. The next prime is 721352669. The reversal of 721352664 is 466253127.

721352664 is a `hidden beast` number, since 72 + 1 + 3 + 526 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721352669) 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, 45454 + ... + 59234.

It is an arithmetic number, because the mean of its divisors is an integer number (40760265).

Almost surely, 2^721352664 is an apocalyptic number.

It is an amenable number.

721352664 is an abundant number, since it is smaller than the sum of its proper divisors (1235140056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721352664 is a wasteful number, since it uses less digits than its factorization.

721352664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14520 (or 14513 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 721352664 is about 26858.0093082120. The cubic root of 721352664 is about 896.8418791914.

The spelling of 721352664 in words is "seven hundred twenty-one million, three hundred fifty-two thousand, six hundred sixty-four".