721407307660 has 48 divisors (see below), whose sum is σ = 1727460405216. Its totient is φ = 250697198592.

The previous prime is 721407307651. The next prime is 721407307661. The reversal of 721407307660 is 66703704127.

It is not an unprimeable number, because it can be changed into a prime (721407307661) 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, 81602742 + ... + 81611581.

It is an arithmetic number, because the mean of its divisors is an integer number (35988758442).

Almost surely, 2^721407307660 is an apocalyptic number.

It is an amenable number.

721407307660 is an abundant number, since it is smaller than the sum of its proper divisors (1006053097556).

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

721407307660 is a wasteful number, since it uses less digits than its factorization.

721407307660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163214362 (or 163214360 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 43.

The spelling of 721407307660 in words is "seven hundred twenty-one billion, four hundred seven million, three hundred seven thousand, six hundred sixty".