679961979 has 32 divisors (see below), whose sum is σ = 1024531200. Its totient is φ = 445633920.

The previous prime is 679961969. The next prime is 679961993. The reversal of 679961979 is 979169976.

679961979 is a `hidden beast` number, since 6 + 7 + 9 + 9 + 619 + 7 + 9 = 666.

It is not a de Polignac number, because 679961979 - 2⁹ = 679961467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (679961969) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 539452 + ... + 540710.

It is an arithmetic number, because the mean of its divisors is an integer number (32016600).

Almost surely, 2^679961979 is an apocalyptic number.

679961979 is a deficient number, since it is larger than the sum of its proper divisors (344569221).

679961979 is a wasteful number, since it uses less digits than its factorization.

679961979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592 (or 1586 counting only the distinct ones).

The product of its digits is 11573604, while the sum is 63.

The square root of 679961979 is about 26076.0805912238. The cubic root of 679961979 is about 879.3495447280.

The spelling of 679961979 in words is "six hundred seventy-nine million, nine hundred sixty-one thousand, nine hundred seventy-nine".