721684075076 has 12 divisors (see below), whose sum is σ = 1263537032940. Its totient is φ = 360673494240.

The previous prime is 721684075061. The next prime is 721684075129. The reversal of 721684075076 is 670570486127.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 661089329476 + 60594745600 = 813074^2 + 246160^2 .

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

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, 42126191 + ... + 42143318.

It is an arithmetic number, because the mean of its divisors is an integer number (105294752745).

Almost surely, 2^721684075076 is an apocalyptic number.

It is an amenable number.

721684075076 is a deficient number, since it is larger than the sum of its proper divisors (541852957864).

721684075076 is a wasteful number, since it uses less digits than its factorization.

721684075076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84271654 (or 84271652 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 53.

The spelling of 721684075076 in words is "seven hundred twenty-one billion, six hundred eighty-four million, seventy-five thousand, seventy-six".