668769838 has 16 divisors (see below), whose sum is σ = 1112901120. Its totient is φ = 298833400.

The previous prime is 668769811. The next prime is 668769853. The reversal of 668769838 is 838967866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256318 + ... + 258913.

It is an arithmetic number, because the mean of its divisors is an integer number (69556320).

Almost surely, 2^668769838 is an apocalyptic number.

668769838 is a deficient number, since it is larger than the sum of its proper divisors (444131282).

668769838 is a wasteful number, since it uses less digits than its factorization.

668769838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515303.

The product of its digits is 20901888, while the sum is 61.

The square root of 668769838 is about 25860.5846414964. The cubic root of 668769838 is about 874.4981450877.

The spelling of 668769838 in words is "six hundred sixty-eight million, seven hundred sixty-nine thousand, eight hundred thirty-eight".