721152620 has 24 divisors (see below), whose sum is σ = 1515704400. Its totient is φ = 288216512.

The previous prime is 721152617. The next prime is 721152623. The reversal of 721152620 is 26251127.

It is an interprime number because it is at equal distance from previous prime (721152617) and next prime (721152623).

It is a super-2 number, since 2×721152620² = 1040122202665728800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 721152620.

It is not an unprimeable number, because it can be changed into a prime (721152623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9911 + ... + 39249.

It is an arithmetic number, because the mean of its divisors is an integer number (63154350).

Almost surely, 2^721152620 is an apocalyptic number.

It is an amenable number.

721152620 is an abundant number, since it is smaller than the sum of its proper divisors (794551780).

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

721152620 is a wasteful number, since it uses less digits than its factorization.

721152620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30577 (or 30575 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 721152620 is about 26854.2849467268. The cubic root of 721152620 is about 896.7589680937.

The spelling of 721152620 in words is "seven hundred twenty-one million, one hundred fifty-two thousand, six hundred twenty".