679985291808 has 72 divisors (see below), whose sum is σ = 1936725404796. Its totient is φ = 226308096000.

The previous prime is 679985291767. The next prime is 679985291809. The reversal of 679985291808 is 808192589976.

679985291808 is a `hidden beast` number, since 6 + 7 + 9 + 98 + 529 + 1 + 8 + 0 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 569886088464 + 110099203344 = 754908^2 + 331812^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (679985291809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1657093 + ... + 2026308.

Almost surely, 2^679985291808 is an apocalyptic number.

It is an amenable number.

679985291808 is an abundant number, since it is smaller than the sum of its proper divisors (1256740112988).

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

679985291808 is a wasteful number, since it uses less digits than its factorization.

679985291808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3684058 (or 3684047 counting only the distinct ones).

The product of its (nonzero) digits is 156764160, while the sum is 72.

The spelling of 679985291808 in words is "six hundred seventy-nine billion, nine hundred eighty-five million, two hundred ninety-one thousand, eight hundred eight".