679999999 has 6 divisors (see below), whose sum is σ = 791020464. Its totient is φ = 582857100.

The previous prime is 679999963. The next prime is 680000003. The reversal of 679999999 is 999999976.

It is not a de Polignac number, because 679999999 - 2¹⁷ = 679868927 is a prime.

It is a Duffinian number.

679999999 is a modest number, since divided by 99999 gives 6799 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679999939) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6938727 + ... + 6938824.

It is an arithmetic number, because the mean of its divisors is an integer number (131836744).

Almost surely, 2^679999999 is an apocalyptic number.

679999999 is a deficient number, since it is larger than the sum of its proper divisors (111020465).

679999999 is a wasteful number, since it uses less digits than its factorization.

679999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13877565 (or 13877558 counting only the distinct ones).

The product of its digits is 200884698, while the sum is 76.

The square root of 679999999 is about 26076.8096016365. The cubic root of 679999999 is about 879.3659340006.

The spelling of 679999999 in words is "six hundred seventy-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".