721716672 has 112 divisors (see below), whose sum is σ = 2064755840. Its totient is φ = 221709312.

The previous prime is 721716661. The next prime is 721716689. The reversal of 721716672 is 276617127.

It is a self number, because there is not a number n which added to its sum of digits gives 721716672.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132303 + ... + 137649.

It is an arithmetic number, because the mean of its divisors is an integer number (18435320).

Almost surely, 2^721716672 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 721716672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1032377920).

721716672 is an abundant number, since it is smaller than the sum of its proper divisors (1343039168).

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

721716672 is a wasteful number, since it uses less digits than its factorization.

721716672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5418 (or 5408 counting only the distinct ones).

The product of its digits is 49392, while the sum is 39.

The square root of 721716672 is about 26864.7849795974. The cubic root of 721716672 is about 896.9927082003.

The spelling of 721716672 in words is "seven hundred twenty-one million, seven hundred sixteen thousand, six hundred seventy-two".