721085976 has 112 divisors (see below), whose sum is σ = 2183289360. Its totient is φ = 221849280.

The previous prime is 721085969. The next prime is 721085987. The reversal of 721085976 is 679580127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 71061 + ... + 80571.

It is an arithmetic number, because the mean of its divisors is an integer number (19493655).

Almost surely, 2^721085976 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 721085976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1091644680).

721085976 is an abundant number, since it is smaller than the sum of its proper divisors (1462203384).

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

721085976 is a wasteful number, since it uses less digits than its factorization.

721085976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9548 (or 9529 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 721085976 is about 26853.0440732517. The cubic root of 721085976 is about 896.7313431296.

The spelling of 721085976 in words is "seven hundred twenty-one million, eighty-five thousand, nine hundred seventy-six".