68979647 has 4 divisors (see below), whose sum is σ = 75250536. Its totient is φ = 62708760.

The previous prime is 68979641. The next prime is 68979653. The reversal of 68979647 is 74697986.

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

It is an interprime number because it is at equal distance from previous prime (68979641) and next prime (68979653).

It is a cyclic number.

It is not a de Polignac number, because 68979647 - 2²⁴ = 52202431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68979592 and 68979601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68979641) 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, 3135428 + ... + 3135449.

It is an arithmetic number, because the mean of its divisors is an integer number (18812634).

Almost surely, 2^68979647 is an apocalyptic number.

68979647 is a deficient number, since it is larger than the sum of its proper divisors (6270889).

68979647 is a wasteful number, since it uses less digits than its factorization.

68979647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6270888.

The product of its digits is 4572288, while the sum is 56.

The square root of 68979647 is about 8305.3986659281. The cubic root of 68979647 is about 410.1162609023.

The spelling of 68979647 in words is "sixty-eight million, nine hundred seventy-nine thousand, six hundred forty-seven".