680040765 has 20 divisors (see below), whose sum is σ = 1219036764. Its totient is φ = 362688192.

The previous prime is 680040671. The next prime is 680040833. The reversal of 680040765 is 567040086.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 417017241 + 263023524 = 20421^2 + 16218^2 .

It is not a de Polignac number, because 680040765 - 2¹⁰ = 680039741 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct 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 (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 839152 + ... + 839961.

Almost surely, 2^680040765 is an apocalyptic number.

It is an amenable number.

680040765 is a deficient number, since it is larger than the sum of its proper divisors (538995999).

680040765 is a wasteful number, since it uses less digits than its factorization.

680040765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679130 (or 1679121 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 680040765 is about 26077.5912422908. The cubic root of 680040765 is about 879.3835063120.

The spelling of 680040765 in words is "six hundred eighty million, forty thousand, seven hundred sixty-five".