720881655 has 32 divisors (see below), whose sum is σ = 1246619136. Its totient is φ = 353614464.

The previous prime is 720881621. The next prime is 720881677. The reversal of 720881655 is 556188027.

It is a de Polignac number, because none of the positive numbers 2^k-720881655 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48654 + ... + 61716.

It is an arithmetic number, because the mean of its divisors is an integer number (38956848).

Almost surely, 2^720881655 is an apocalyptic number.

720881655 is a deficient number, since it is larger than the sum of its proper divisors (525737481).

720881655 is a wasteful number, since it uses less digits than its factorization.

720881655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13367.

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 720881655 is about 26849.2393747011. The cubic root of 720881655 is about 896.6466383191.

The spelling of 720881655 in words is "seven hundred twenty million, eight hundred eighty-one thousand, six hundred fifty-five".