721120568 has 32 divisors (see below), whose sum is σ = 1553288160. Its totient is φ = 307445760.

The previous prime is 721120553. The next prime is 721120649. The reversal of 721120568 is 865021127.

It is a congruent number.

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, 22553 + ... + 44168.

It is an arithmetic number, because the mean of its divisors is an integer number (48540255).

Almost surely, 2^721120568 is an apocalyptic number.

It is an amenable number.

721120568 is an abundant number, since it is smaller than the sum of its proper divisors (832167592).

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

721120568 is a wasteful number, since it uses less digits than its factorization.

721120568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66927 (or 66923 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 721120568 is about 26853.6881638258. The cubic root of 721120568 is about 896.7456822586.

The spelling of 721120568 in words is "seven hundred twenty-one million, one hundred twenty thousand, five hundred sixty-eight".