721317012 has 36 divisors (see below), whose sum is σ = 1822504320. Its totient is φ = 221943072.

The previous prime is 721317001. The next prime is 721317049. The reversal of 721317012 is 210713127.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175812 + ... + 179867.

It is an arithmetic number, because the mean of its divisors is an integer number (50625120).

Almost surely, 2^721317012 is an apocalyptic number.

It is an amenable number.

721317012 is an abundant number, since it is smaller than the sum of its proper divisors (1101187308).

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

721317012 is a wasteful number, since it uses less digits than its factorization.

721317012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355712 (or 355697 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 721317012 is about 26857.3455873807. The cubic root of 721317012 is about 896.8271038326.

The spelling of 721317012 in words is "seven hundred twenty-one million, three hundred seventeen thousand, twelve".