680879651 has 4 divisors (see below), whose sum is σ = 681404304. Its totient is φ = 680355000.

The previous prime is 680879561. The next prime is 680879653. The reversal of 680879651 is 156978086.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680879651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 680879651.

It is not an unprimeable number, because it can be changed into a prime (680879653) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 260375 + ... + 262976.

It is an arithmetic number, because the mean of its divisors is an integer number (170351076).

Almost surely, 2^680879651 is an apocalyptic number.

680879651 is a deficient number, since it is larger than the sum of its proper divisors (524653).

680879651 is a wasteful number, since it uses less digits than its factorization.

680879651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524652.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 680879651 is about 26093.6707076640. The cubic root of 680879651 is about 879.7449549285.

The spelling of 680879651 in words is "six hundred eighty million, eight hundred seventy-nine thousand, six hundred fifty-one".