721134976 has 16 divisors (see below), whose sum is σ = 1436636340. Its totient is φ = 360567424.

The previous prime is 721134971. The next prime is 721135007. The reversal of 721134976 is 679431127.

721134976 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×721134976² = 1040071307221041152, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721134971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2816806 + ... + 2817061.

Almost surely, 2^721134976 is an apocalyptic number.

It is an amenable number.

721134976 is a deficient number, since it is larger than the sum of its proper divisors (715501364).

721134976 is an equidigital number, since it uses as much as digits as its factorization.

721134976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5633881 (or 5633869 counting only the distinct ones).

The product of its digits is 63504, while the sum is 40.

The square root of 721134976 is about 26853.9564310364. The cubic root of 721134976 is about 896.7516545497.

The spelling of 721134976 in words is "seven hundred twenty-one million, one hundred thirty-four thousand, nine hundred seventy-six".