68168139 has 16 divisors (see below), whose sum is σ = 98660352. Its totient is φ = 41616288.

The previous prime is 68168137. The next prime is 68168141. The reversal of 68168139 is 93186186.

It is an interprime number because it is at equal distance from previous prime (68168137) and next prime (68168141).

It is not a de Polignac number, because 68168139 - 2¹ = 68168137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68168139.

It is not an unprimeable number, because it can be changed into a prime (68168131) 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, 1929 + ... + 11834.

It is an arithmetic number, because the mean of its divisors is an integer number (6166272).

Almost surely, 2^68168139 is an apocalyptic number.

68168139 is a deficient number, since it is larger than the sum of its proper divisors (30492213).

68168139 is a wasteful number, since it uses less digits than its factorization.

68168139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13906.

The product of its digits is 62208, while the sum is 42.

The square root of 68168139 is about 8256.3998813042. The cubic root of 68168139 is about 408.5016477109.

The spelling of 68168139 in words is "sixty-eight million, one hundred sixty-eight thousand, one hundred thirty-nine".