720565816 has 32 divisors (see below), whose sum is σ = 1388404080. Its totient is φ = 350380800.

The previous prime is 720565777. The next prime is 720565837. The reversal of 720565816 is 618565027.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 105250 + ... + 111886.

Almost surely, 2^720565816 is an apocalyptic number.

It is an amenable number.

720565816 is a deficient number, since it is larger than the sum of its proper divisors (667838264).

720565816 is a wasteful number, since it uses less digits than its factorization.

720565816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7015 (or 7011 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 720565816 is about 26843.3570180780. The cubic root of 720565816 is about 896.5156702910.

The spelling of 720565816 in words is "seven hundred twenty million, five hundred sixty-five thousand, eight hundred sixteen".