721402686976 has 40 divisors (see below), whose sum is σ = 1441523294640. Its totient is φ = 360669585408.

The previous prime is 721402686937. The next prime is 721402687007. The reversal of 721402686976 is 679686204127.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 721402686976.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6419560 + ... + 6530968.

It is an arithmetic number, because the mean of its divisors is an integer number (36038082366).

Almost surely, 2^721402686976 is an apocalyptic number.

It is an amenable number.

721402686976 is a deficient number, since it is larger than the sum of its proper divisors (720120607664).

721402686976 is a wasteful number, since it uses less digits than its factorization.

721402686976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124074 (or 124058 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 58.

The spelling of 721402686976 in words is "seven hundred twenty-one billion, four hundred two million, six hundred eighty-six thousand, nine hundred seventy-six".