721094720 has 112 divisors (see below), whose sum is σ = 1787639808. Its totient is φ = 276756480.

The previous prime is 721094719. The next prime is 721094741. The reversal of 721094720 is 27490127.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 1557209 + ... + 1557671.

Almost surely, 2^721094720 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 721094720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (893819904).

721094720 is an abundant number, since it is smaller than the sum of its proper divisors (1066545088).

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

721094720 is a wasteful number, since it uses less digits than its factorization.

721094720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 721094720 is about 26853.2068848397. The cubic root of 721094720 is about 896.7349677492.

The spelling of 721094720 in words is "seven hundred twenty-one million, ninety-four thousand, seven hundred twenty".