677686979 has 4 divisors (see below), whose sum is σ = 678630240. Its totient is φ = 676743720.

The previous prime is 677686967. The next prime is 677687053. The reversal of 677686979 is 979686776.

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 677686979 - 2²⁴ = 660909763 is a prime.

It is a super-2 number, since 2×677686979² = 918519283012292882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (677686679) 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, 470552 + ... + 471989.

It is an arithmetic number, because the mean of its divisors is an integer number (169657560).

Almost surely, 2^677686979 is an apocalyptic number.

677686979 is a deficient number, since it is larger than the sum of its proper divisors (943261).

677686979 is an equidigital number, since it uses as much as digits as its factorization.

677686979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943260.

The product of its digits is 48009024, while the sum is 65.

The square root of 677686979 is about 26032.4216891168. The cubic root of 677686979 is about 878.3677469562.

It can be divided in two parts, 67768 and 6979, that added together give a palindrome (74747).

The spelling of 677686979 in words is "six hundred seventy-seven million, six hundred eighty-six thousand, nine hundred seventy-nine".