721692012 has 24 divisors (see below), whose sum is σ = 1712491200. Its totient is φ = 236486416.

The previous prime is 721691981. The next prime is 721692073. The reversal of 721692012 is 210296127.

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, 508962 + ... + 510377.

It is an arithmetic number, because the mean of its divisors is an integer number (71353800).

Almost surely, 2^721692012 is an apocalyptic number.

It is an amenable number.

721692012 is an abundant number, since it is smaller than the sum of its proper divisors (990799188).

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

721692012 is a wasteful number, since it uses less digits than its factorization.

721692012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019405 (or 1019403 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 721692012 is about 26864.3260105293. The cubic root of 721692012 is about 896.9824917756.

The spelling of 721692012 in words is "seven hundred twenty-one million, six hundred ninety-two thousand, twelve".