721760670 has 96 divisors (see below), whose sum is σ = 2029442688. Its totient is φ = 177275904.

The previous prime is 721760639. The next prime is 721760713. The reversal of 721760670 is 76067127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66892 + ... + 76928.

It is an arithmetic number, because the mean of its divisors is an integer number (21140028).

Almost surely, 2^721760670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721760670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1014721344).

721760670 is an abundant number, since it is smaller than the sum of its proper divisors (1307682018).

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

721760670 is a wasteful number, since it uses less digits than its factorization.

721760670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10114 (or 10111 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 721760670 is about 26865.6038458100. The cubic root of 721760670 is about 897.0109356131.

The spelling of 721760670 in words is "seven hundred twenty-one million, seven hundred sixty thousand, six hundred seventy".