720402685 has 16 divisors (see below), whose sum is σ = 886956480. Its totient is φ = 561514240.

The previous prime is 720402679. The next prime is 720402731. The reversal of 720402685 is 586204027.

It is a de Polignac number, because none of the positive numbers 2^k-720402685 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 720402685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22530 + ... + 44140.

It is an arithmetic number, because the mean of its divisors is an integer number (55434780).

Almost surely, 2^720402685 is an apocalyptic number.

It is an amenable number.

720402685 is a deficient number, since it is larger than the sum of its proper divisors (166553795).

720402685 is a wasteful number, since it uses less digits than its factorization.

720402685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21788.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 720402685 is about 26840.3182730757. The cubic root of 720402685 is about 896.4480102510.

The spelling of 720402685 in words is "seven hundred twenty million, four hundred two thousand, six hundred eighty-five".