721656112 has 20 divisors (see below), whose sum is σ = 1401004080. Its totient is φ = 360106688.

The previous prime is 721656083. The next prime is 721656121. The reversal of 721656112 is 211656127.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36787 + ... + 52882.

It is an arithmetic number, because the mean of its divisors is an integer number (70050204).

Almost surely, 2^721656112 is an apocalyptic number.

It is an amenable number.

721656112 is a deficient number, since it is larger than the sum of its proper divisors (679347968).

721656112 is a wasteful number, since it uses less digits than its factorization.

721656112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90180 (or 90174 counting only the distinct ones).

The product of its digits is 5040, while the sum is 31.

The square root of 721656112 is about 26863.6578298638. The cubic root of 721656112 is about 896.9676183000.

The spelling of 721656112 in words is "seven hundred twenty-one million, six hundred fifty-six thousand, one hundred twelve".