721078722 has 72 divisors (see below), whose sum is σ = 1933498944. Its totient is φ = 190168992.

The previous prime is 721078717. The next prime is 721078733. The reversal of 721078722 is 227870127.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4363 + ... + 38225.

It is an arithmetic number, because the mean of its divisors is an integer number (26854152).

Almost surely, 2^721078722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721078722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (966749472).

721078722 is an abundant number, since it is smaller than the sum of its proper divisors (1212420222).

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

721078722 is a wasteful number, since it uses less digits than its factorization.

721078722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33904 (or 33888 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 721078722 is about 26852.9090044263. The cubic root of 721078722 is about 896.7283361322.

The spelling of 721078722 in words is "seven hundred twenty-one million, seventy-eight thousand, seven hundred twenty-two".