68642279 has 2 divisors, whose sum is σ = 68642280. Its totient is φ = 68642278.

The previous prime is 68642267. The next prime is 68642317. The reversal of 68642279 is 97224686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68642279 - 2⁸ = 68642023 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68642219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34321139 + 34321140.

It is an arithmetic number, because the mean of its divisors is an integer number (34321140).

Almost surely, 2^68642279 is an apocalyptic number.

68642279 is a deficient number, since it is larger than the sum of its proper divisors (1).

68642279 is an equidigital number, since it uses as much as digits as its factorization.

68642279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 44.

The square root of 68642279 is about 8285.0636086876. The cubic root of 68642279 is about 409.4465644094.

It can be divided in two parts, 68642 and 279, that added together give a cube (68921 = 41³).

The spelling of 68642279 in words is "sixty-eight million, six hundred forty-two thousand, two hundred seventy-nine".