677879639 has 4 divisors (see below), whose sum is σ = 680088024. Its totient is φ = 675671256.

The previous prime is 677879603. The next prime is 677879647. The reversal of 677879639 is 936978776.

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 677879639 - 2²⁰ = 676831063 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 (677879039) 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, 1103732 + ... + 1104345.

It is an arithmetic number, because the mean of its divisors is an integer number (170022006).

Almost surely, 2^677879639 is an apocalyptic number.

677879639 is a deficient number, since it is larger than the sum of its proper divisors (2208385).

677879639 is a wasteful number, since it uses less digits than its factorization.

677879639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208384.

The product of its digits is 24004512, while the sum is 62.

The square root of 677879639 is about 26036.1218118214. The cubic root of 677879639 is about 878.4509762845.

The spelling of 677879639 in words is "six hundred seventy-seven million, eight hundred seventy-nine thousand, six hundred thirty-nine".