67979878879 has 4 divisors (see below), whose sum is σ = 74159867880. Its totient is φ = 61799889880.

The previous prime is 67979878871. The next prime is 67979878909. The reversal of 67979878879 is 97887897976.

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 67979878879 - 2³ = 67979878871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67979878796 and 67979878805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67979878871) 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, 3089994484 + ... + 3089994505.

It is an arithmetic number, because the mean of its divisors is an integer number (18539966970).

Almost surely, 2^67979878879 is an apocalyptic number.

67979878879 is a deficient number, since it is larger than the sum of its proper divisors (6179989001).

67979878879 is a wasteful number, since it uses less digits than its factorization.

67979878879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6179989000.

The product of its digits is 5377010688, while the sum is 85.

The spelling of 67979878879 in words is "sixty-seven billion, nine hundred seventy-nine million, eight hundred seventy-eight thousand, eight hundred seventy-nine".