721317260 has 48 divisors (see below), whose sum is σ = 1617428736. Its totient is φ = 269556672.

The previous prime is 721317239. The next prime is 721317323. The reversal of 721317260 is 62713127.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1547 + ... + 38013.

It is an arithmetic number, because the mean of its divisors is an integer number (33696432).

Almost surely, 2^721317260 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 721317260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (808714368).

721317260 is an abundant number, since it is smaller than the sum of its proper divisors (896111476).

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

721317260 is a wasteful number, since it uses less digits than its factorization.

721317260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36542 (or 36540 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 721317260 is about 26857.3502043668. The cubic root of 721317260 is about 896.8272066136.

The spelling of 721317260 in words is "seven hundred twenty-one million, three hundred seventeen thousand, two hundred sixty".