679807881 has 12 divisors (see below), whose sum is σ = 988536900. Its totient is φ = 450162720.

The previous prime is 679807841. The next prime is 679807903. The reversal of 679807881 is 188708976.

It can be written as a sum of positive squares in 2 ways, for example, as 53056656 + 626751225 = 7284^2 + 25035^2 .

It is not a de Polignac number, because 679807881 - 2¹⁹ = 679283593 is a prime.

It is a super-2 number, since 2×679807881² = 924277510139420322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (679807801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 252130 + ... + 254811.

It is an arithmetic number, because the mean of its divisors is an integer number (82378075).

Almost surely, 2^679807881 is an apocalyptic number.

It is an amenable number.

679807881 is a deficient number, since it is larger than the sum of its proper divisors (308729019).

679807881 is a wasteful number, since it uses less digits than its factorization.

679807881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507096 (or 507093 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 54.

The square root of 679807881 is about 26073.1256469185. The cubic root of 679807881 is about 879.2831114822.

The spelling of 679807881 in words is "six hundred seventy-nine million, eight hundred seven thousand, eight hundred eighty-one".