680499491 has 8 divisors (see below), whose sum is σ = 777913344. Its totient is φ = 583135560.

The previous prime is 680499481. The next prime is 680499499. The reversal of 680499491 is 194994086.

It is a happy number.

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

It is not a de Polignac number, because 680499491 - 2²² = 676305187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680499499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23756 + ... + 43878.

It is an arithmetic number, because the mean of its divisors is an integer number (97239168).

Almost surely, 2^680499491 is an apocalyptic number.

680499491 is a deficient number, since it is larger than the sum of its proper divisors (97413853).

680499491 is a wasteful number, since it uses less digits than its factorization.

680499491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24961.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 680499491 is about 26086.3851654460. The cubic root of 680499491 is about 879.5811931903.

The spelling of 680499491 in words is "six hundred eighty million, four hundred ninety-nine thousand, four hundred ninety-one".