68840279 has 6 divisors (see below), whose sum is σ = 69291936. Its totient is φ = 68391540.

The previous prime is 68840267. The next prime is 68840309. The reversal of 68840279 is 97204886.

It is not a de Polignac number, because 68840279 - 2⁴ = 68840263 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 (68840479) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25274 + ... + 27864.

It is an arithmetic number, because the mean of its divisors is an integer number (11548656).

Almost surely, 2^68840279 is an apocalyptic number.

68840279 is a deficient number, since it is larger than the sum of its proper divisors (451657).

68840279 is an equidigital number, since it uses as much as digits as its factorization.

68840279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2917 (or 2754 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 68840279 is about 8297.0042183911. The cubic root of 68840279 is about 409.8398720320.

The spelling of 68840279 in words is "sixty-eight million, eight hundred forty thousand, two hundred seventy-nine".