676779409 has 4 divisors (see below), whose sum is σ = 700116660. Its totient is φ = 653442160.

The previous prime is 676779403. The next prime is 676779413. The reversal of 676779409 is 904977676.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 112954384 + 563825025 = 10628^2 + 23745^2 .

It is a cyclic number.

It is not a de Polignac number, because 676779409 - 2⁷ = 676779281 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 676779409.

It is not an unprimeable number, because it can be changed into a prime (676779403) 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, 11668582 + ... + 11668639.

It is an arithmetic number, because the mean of its divisors is an integer number (175029165).

Almost surely, 2^676779409 is an apocalyptic number.

It is an amenable number.

676779409 is a deficient number, since it is larger than the sum of its proper divisors (23337251).

676779409 is a wasteful number, since it uses less digits than its factorization.

676779409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23337250.

The product of its (nonzero) digits is 4000752, while the sum is 55.

The square root of 676779409 is about 26014.9843167356. The cubic root of 676779409 is about 877.9754634135.

The spelling of 676779409 in words is "six hundred seventy-six million, seven hundred seventy-nine thousand, four hundred nine".