721525072323704 has 128 divisors (see below), whose sum is σ = 1505226602880000. Its totient is φ = 321510267386880.

The previous prime is 721525072323697. The next prime is 721525072323721. The reversal of 721525072323704 is 407323270525127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 508081157 + ... + 509499275.

It is an arithmetic number, because the mean of its divisors is an integer number (11759582835000).

Almost surely, 2^{721525072323704} 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 721525072323704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (752613301440000).

721525072323704 is an abundant number, since it is smaller than the sum of its proper divisors (783701530556296).

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

721525072323704 is a wasteful number, since it uses less digits than its factorization.

721525072323704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418781 (or 1418777 counting only the distinct ones).

The product of its (nonzero) digits is 4939200, while the sum is 50.

The spelling of 721525072323704 in words is "seven hundred twenty-one trillion, five hundred twenty-five billion, seventy-two million, three hundred twenty-three thousand, seven hundred four".