668870839 has 16 divisors (see below), whose sum is σ = 827794240. Its totient is φ = 526279680.

The previous prime is 668870833. The next prime is 668870869. The reversal of 668870839 is 938078866.

It is a cyclic number.

It is not a de Polignac number, because 668870839 - 2¹³ = 668862647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668870839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668870833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3834 + ... + 36775.

It is an arithmetic number, because the mean of its divisors is an integer number (51737140).

Almost surely, 2^668870839 is an apocalyptic number.

668870839 is a deficient number, since it is larger than the sum of its proper divisors (158923401).

668870839 is a wasteful number, since it uses less digits than its factorization.

668870839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40810.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 668870839 is about 25862.5373658502. The cubic root of 668870839 is about 874.5421665811.

The spelling of 668870839 in words is "six hundred sixty-eight million, eight hundred seventy thousand, eight hundred thirty-nine".