68439818 has 8 divisors (see below), whose sum is σ = 102715140. Its totient is φ = 34201440.

The previous prime is 68439809. The next prime is 68439821. The reversal of 68439818 is 81893486.

It can be written as a sum of positive squares in 2 ways, for example, as 66471409 + 1968409 = 8153^2 + 1403^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4013 + ... + 12368.

Almost surely, 2^68439818 is an apocalyptic number.

68439818 is a deficient number, since it is larger than the sum of its proper divisors (34275322).

68439818 is a wasteful number, since it uses less digits than its factorization.

68439818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18472.

The product of its digits is 331776, while the sum is 47.

The square root of 68439818 is about 8272.8361521307. The cubic root of 68439818 is about 409.0436125762.

It can be divided in two parts, 6843 and 9818, that added together give a palindrome (16661).

The spelling of 68439818 in words is "sixty-eight million, four hundred thirty-nine thousand, eight hundred eighteen".