721352164 has 27 divisors (see below), whose sum is σ = 1368265563. Its totient is φ = 332609472.

The previous prime is 721352153. The next prime is 721352167. The reversal of 721352164 is 461253127.

The square root of 721352164 is 26858.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 30713764 + 690638400 = 5542^2 + 26280^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721352167) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 697792 + ... + 698824.

Almost surely, 2^721352164 is an apocalyptic number.

721352164 is the 26858-th square number.

It is an amenable number.

721352164 is a deficient number, since it is larger than the sum of its proper divisors (646913399).

721352164 is a wasteful number, since it uses less digits than its factorization.

721352164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096 (or 1048 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The cubic root of 721352164 is about 896.8416719784.

The spelling of 721352164 in words is "seven hundred twenty-one million, three hundred fifty-two thousand, one hundred sixty-four".