680686690 has 8 divisors (see below), whose sum is σ = 1225236060. Its totient is φ = 272274672.

The previous prime is 680686687. The next prime is 680686691. The reversal of 680686690 is 96686086.

It can be written as a sum of positive squares in 2 ways, for example, as 665794809 + 14891881 = 25803^2 + 3859^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×680686690² = 926668739886312200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (680686691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34034325 + ... + 34034344.

Almost surely, 2^680686690 is an apocalyptic number.

680686690 is a deficient number, since it is larger than the sum of its proper divisors (544549370).

680686690 is a wasteful number, since it uses less digits than its factorization.

680686690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68068676.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 680686690 is about 26089.9729781386. The cubic root of 680686690 is about 879.6618406293.

The spelling of 680686690 in words is "six hundred eighty million, six hundred eighty-six thousand, six hundred ninety".