726722664 has 64 divisors (see below), whose sum is σ = 1928448000. Its totient is φ = 227426304.

The previous prime is 726722653. The next prime is 726722671. The reversal of 726722664 is 466227627.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181209 + ... + 185175.

It is an arithmetic number, because the mean of its divisors is an integer number (30132000).

Almost surely, 2^726722664 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 726722664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964224000).

726722664 is an abundant number, since it is smaller than the sum of its proper divisors (1201725336).

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

726722664 is a wasteful number, since it uses less digits than its factorization.

726722664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4442 (or 4438 counting only the distinct ones).

The product of its digits is 338688, while the sum is 42.

The square root of 726722664 is about 26957.7941234071. The cubic root of 726722664 is about 899.0618471080.

The spelling of 726722664 in words is "seven hundred twenty-six million, seven hundred twenty-two thousand, six hundred sixty-four".