680745591 has 24 divisors (see below), whose sum is σ = 1008767760. Its totient is φ = 442108800.

The previous prime is 680745577. The next prime is 680745601. The reversal of 680745591 is 195547086.

It is not a de Polignac number, because 680745591 - 2²² = 676551287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680745511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 475665 + ... + 477093.

It is an arithmetic number, because the mean of its divisors is an integer number (42031990).

Almost surely, 2^680745591 is an apocalyptic number.

680745591 is a deficient number, since it is larger than the sum of its proper divisors (328022169).

680745591 is a wasteful number, since it uses less digits than its factorization.

680745591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767 (or 2764 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 680745591 is about 26091.1017590289. The cubic root of 680745591 is about 879.6872127858.

The spelling of 680745591 in words is "six hundred eighty million, seven hundred forty-five thousand, five hundred ninety-one".