721973672 has 16 divisors (see below), whose sum is σ = 1547086560. Its totient is φ = 309417264.

The previous prime is 721973671. The next prime is 721973683. The reversal of 721973672 is 276379127.

It is a super-2 number, since 2×721973672² = 1042491966122327168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (721973671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6446138 + ... + 6446249.

It is an arithmetic number, because the mean of its divisors is an integer number (96692910).

Almost surely, 2^721973672 is an apocalyptic number.

It is an amenable number.

721973672 is an abundant number, since it is smaller than the sum of its proper divisors (825112888).

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

721973672 is a wasteful number, since it uses less digits than its factorization.

721973672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12892400 (or 12892396 counting only the distinct ones).

The product of its digits is 222264, while the sum is 44.

The square root of 721973672 is about 26869.5677672716. The cubic root of 721973672 is about 897.0991672292.

The spelling of 721973672 in words is "seven hundred twenty-one million, nine hundred seventy-three thousand, six hundred seventy-two".