721707742 has 64 divisors (see below), whose sum is σ = 1335559680. Its totient is φ = 285659136.

The previous prime is 721707709. The next prime is 721707751. The reversal of 721707742 is 247707127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2141398 + ... + 2141734.

It is an arithmetic number, because the mean of its divisors is an integer number (20868120).

Almost surely, 2^721707742 is an apocalyptic number.

721707742 is a deficient number, since it is larger than the sum of its proper divisors (613851938).

721707742 is a wasteful number, since it uses less digits than its factorization.

721707742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545.

The product of its (nonzero) digits is 38416, while the sum is 37.

The square root of 721707742 is about 26864.6187763757. The cubic root of 721707742 is about 896.9890086054.

The spelling of 721707742 in words is "seven hundred twenty-one million, seven hundred seven thousand, seven hundred forty-two".