67988879 has 4 divisors (see below), whose sum is σ = 77701584. Its totient is φ = 58276176.

The previous prime is 67988867. The next prime is 67988881. The reversal of 67988879 is 97888976.

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

It is not a de Polignac number, because 67988879 - 2⁴ = 67988863 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 (67988839) 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, 4856342 + ... + 4856355.

It is an arithmetic number, because the mean of its divisors is an integer number (19425396).

Almost surely, 2^67988879 is an apocalyptic number.

67988879 is a deficient number, since it is larger than the sum of its proper divisors (9712705).

67988879 is an equidigital number, since it uses as much as digits as its factorization.

67988879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9712704.

The product of its digits is 12192768, while the sum is 62.

The square root of 67988879 is about 8245.5369139917. The cubic root of 67988879 is about 408.1432579559.

The spelling of 67988879 in words is "sixty-seven million, nine hundred eighty-eight thousand, eight hundred seventy-nine".