721674220 has 48 divisors (see below), whose sum is σ = 1585059840. Its totient is φ = 275481536.

The previous prime is 721674179. The next prime is 721674229. The reversal of 721674220 is 22476127.

It is not an unprimeable number, because it can be changed into a prime (721674229) 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, 229821 + ... + 232939.

It is an arithmetic number, because the mean of its divisors is an integer number (33022080).

Almost surely, 2^721674220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721674220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792529920).

721674220 is an abundant number, since it is smaller than the sum of its proper divisors (863385620).

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

721674220 is a wasteful number, since it uses less digits than its factorization.

721674220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3654 (or 3652 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 721674220 is about 26863.9948630132. The cubic root of 721674220 is about 896.9751205593.

The spelling of 721674220 in words is "seven hundred twenty-one million, six hundred seventy-four thousand, two hundred twenty".