722641924 has 9 divisors (see below), whose sum is σ = 1264717461. Its totient is φ = 361294080.

The previous prime is 722641921. The next prime is 722641939. The reversal of 722641924 is 429146227.

The square root of 722641924 is 26882.

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

It can be written as a sum of positive squares in only one way, i.e., 99640324 + 623001600 = 9982^2 + 24960^2 .

It is a super-2 number, since 2×722641924² = 1044422700644843552, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722641921) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 47044 + ... + 60484.

Almost surely, 2^722641924 is an apocalyptic number.

722641924 is the 26882-nd square number.

It is an amenable number.

722641924 is a deficient number, since it is larger than the sum of its proper divisors (542075537).

722641924 is an frugal number, since it uses more digits than its factorization.

722641924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26886 (or 13443 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The cubic root of 722641924 is about 897.3758640446.

The spelling of 722641924 in words is "seven hundred twenty-two million, six hundred forty-one thousand, nine hundred twenty-four".