68719879 has 4 divisors (see below), whose sum is σ = 71089560. Its totient is φ = 66350200.

The previous prime is 68719873. The next prime is 68719897. The reversal of 68719879 is 97891786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68719879 - 2¹⁹ = 68195591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68719873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1184797 + ... + 1184854.

It is an arithmetic number, because the mean of its divisors is an integer number (17772390).

Almost surely, 2^68719879 is an apocalyptic number.

68719879 is a deficient number, since it is larger than the sum of its proper divisors (2369681).

68719879 is a wasteful number, since it uses less digits than its factorization.

68719879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2369680.

The product of its digits is 1524096, while the sum is 55.

The square root of 68719879 is about 8289.7454122548. The cubic root of 68719879 is about 409.6007992252.

The spelling of 68719879 in words is "sixty-eight million, seven hundred nineteen thousand, eight hundred seventy-nine".