680878913 has 16 divisors (see below), whose sum is σ = 834696576. Its totient is φ = 546522240.

The previous prime is 680878879. The next prime is 680878943. The reversal of 680878913 is 319878086.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-680878913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680878943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100220 + ... + 106797.

It is an arithmetic number, because the mean of its divisors is an integer number (52168536).

Almost surely, 2^680878913 is an apocalyptic number.

It is an amenable number.

680878913 is a deficient number, since it is larger than the sum of its proper divisors (153817663).

680878913 is a wasteful number, since it uses less digits than its factorization.

680878913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207064.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 680878913 is about 26093.6565662998. The cubic root of 680878913 is about 879.7446370789.

The spelling of 680878913 in words is "six hundred eighty million, eight hundred seventy-eight thousand, nine hundred thirteen".