679394988 has 36 divisors (see below), whose sum is σ = 1718160808. Its totient is φ = 226359360.

The previous prime is 679394981. The next prime is 679394993. The reversal of 679394988 is 889493976.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (679394981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130320 + ... + 135432.

Almost surely, 2^679394988 is an apocalyptic number.

It is an amenable number.

679394988 is an abundant number, since it is smaller than the sum of its proper divisors (1038765820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

679394988 is a wasteful number, since it uses less digits than its factorization.

679394988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8814 (or 8809 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 63.

The square root of 679394988 is about 26065.2064637900. The cubic root of 679394988 is about 879.1050595265.

It can be divided in two parts, 67939 and 4988, that added together give a palindrome (72927).

The spelling of 679394988 in words is "six hundred seventy-nine million, three hundred ninety-four thousand, nine hundred eighty-eight".