721379456 has 32 divisors (see below), whose sum is σ = 1642428480. Its totient is φ = 309162240.

The previous prime is 721379447. The next prime is 721379497. The reversal of 721379456 is 654973127.

It is a tau number, because it is divible by the number of its divisors (32).

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, 401660 + ... + 403451.

It is an arithmetic number, because the mean of its divisors is an integer number (51325890).

Almost surely, 2^721379456 is an apocalyptic number.

It is an amenable number.

721379456 is an abundant number, since it is smaller than the sum of its proper divisors (921049024).

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

721379456 is an equidigital number, since it uses as much as digits as its factorization.

721379456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805132 (or 805120 counting only the distinct ones).

The product of its digits is 317520, while the sum is 44.

The square root of 721379456 is about 26858.5080747237. The cubic root of 721379456 is about 896.8529823552.

The spelling of 721379456 in words is "seven hundred twenty-one million, three hundred seventy-nine thousand, four hundred fifty-six".