680979797 has 4 divisors (see below), whose sum is σ = 683979936. Its totient is φ = 677979660.

The previous prime is 680979781. The next prime is 680979833. The reversal of 680979797 is 797979086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 680979797 - 2⁴ = 680979781 is a prime.

It is a super-2 number, since 2×680979797² = 927466967844322418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680979737) 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, 1499729 + ... + 1500182.

It is an arithmetic number, because the mean of its divisors is an integer number (170994984).

Almost surely, 2^680979797 is an apocalyptic number.

It is an amenable number.

680979797 is a deficient number, since it is larger than the sum of its proper divisors (3000139).

680979797 is a wasteful number, since it uses less digits than its factorization.

680979797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000138.

The product of its (nonzero) digits is 12002256, while the sum is 62.

The square root of 680979797 is about 26095.5896082077. The cubic root of 680979797 is about 879.7880847332.

The spelling of 680979797 in words is "six hundred eighty million, nine hundred seventy-nine thousand, seven hundred ninety-seven".