677988779 has 8 divisors (see below), whose sum is σ = 761887392. Its totient is φ = 598625280.

The previous prime is 677988769. The next prime is 677988791. The reversal of 677988779 is 977889776.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 677988779 - 2²⁴ = 661211563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (677988769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1133462 + ... + 1134059.

It is an arithmetic number, because the mean of its divisors is an integer number (95235924).

Almost surely, 2^677988779 is an apocalyptic number.

677988779 is a deficient number, since it is larger than the sum of its proper divisors (83898613).

677988779 is a wasteful number, since it uses less digits than its factorization.

677988779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2267557.

The product of its digits is 74680704, while the sum is 68.

The square root of 677988779 is about 26038.2176617371. The cubic root of 677988779 is about 878.4981178857.

The spelling of 677988779 in words is "six hundred seventy-seven million, nine hundred eighty-eight thousand, seven hundred seventy-nine".