721685074 has 16 divisors (see below), whose sum is σ = 1212857856. Its totient is φ = 319172400.

The previous prime is 721685051. The next prime is 721685089. The reversal of 721685074 is 470586127.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442482 + ... + 444109.

It is an arithmetic number, because the mean of its divisors is an integer number (75803616).

Almost surely, 2^721685074 is an apocalyptic number.

721685074 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

721685074 is a deficient number, since it is larger than the sum of its proper divisors (491172782).

721685074 is a wasteful number, since it uses less digits than its factorization.

721685074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886641.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 721685074 is about 26864.1968798622. The cubic root of 721685074 is about 896.9796173802.

The spelling of 721685074 in words is "seven hundred twenty-one million, six hundred eighty-five thousand, seventy-four".