721313164 has 48 divisors (see below), whose sum is σ = 1519199136. Its totient is φ = 295257600.

The previous prime is 721313161. The next prime is 721313191. The reversal of 721313164 is 461313127.

It is not an unprimeable number, because it can be changed into a prime (721313161) 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, 8074 + ... + 38830.

It is an arithmetic number, because the mean of its divisors is an integer number (31649982).

Almost surely, 2^721313164 is an apocalyptic number.

It is an amenable number.

721313164 is an abundant number, since it is smaller than the sum of its proper divisors (797885972).

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

721313164 is a wasteful number, since it uses less digits than its factorization.

721313164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30826 (or 30824 counting only the distinct ones).

The product of its digits is 3024, while the sum is 28.

The square root of 721313164 is about 26857.2739495281. The cubic root of 721313164 is about 896.8255090660.

The spelling of 721313164 in words is "seven hundred twenty-one million, three hundred thirteen thousand, one hundred sixty-four".