879678647 has 4 divisors (see below), whose sum is σ = 880058040. Its totient is φ = 879299256.

The previous prime is 879678637. The next prime is 879678673. The reversal of 879678647 is 746876978.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-879678647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 879678647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (879678637) 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, 186197 + ... + 190862.

It is an arithmetic number, because the mean of its divisors is an integer number (220014510).

Almost surely, 2^879678647 is an apocalyptic number.

879678647 is a deficient number, since it is larger than the sum of its proper divisors (379393).

879678647 is a wasteful number, since it uses less digits than its factorization.

879678647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379392.

The product of its digits is 28449792, while the sum is 62.

The square root of 879678647 is about 29659.3770501000. The cubic root of 879678647 is about 958.1673104575.

The spelling of 879678647 in words is "eight hundred seventy-nine million, six hundred seventy-eight thousand, six hundred forty-seven".