720641768 has 32 divisors (see below), whose sum is σ = 1684618560. Its totient is φ = 280769280.

The previous prime is 720641737. The next prime is 720641771. The reversal of 720641768 is 867146027.

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, 584321 + ... + 585552.

It is an arithmetic number, because the mean of its divisors is an integer number (52644330).

Almost surely, 2^720641768 is an apocalyptic number.

It is an amenable number.

720641768 is an abundant number, since it is smaller than the sum of its proper divisors (963976792).

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

720641768 is a wasteful number, since it uses less digits than its factorization.

720641768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169897 (or 1169893 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 720641768 is about 26844.7717069823. The cubic root of 720641768 is about 896.5471685777.

The spelling of 720641768 in words is "seven hundred twenty million, six hundred forty-one thousand, seven hundred sixty-eight".