677456785 has 4 divisors (see below), whose sum is σ = 812948148. Its totient is φ = 541965424.

The previous prime is 677456779. The next prime is 677456831. The reversal of 677456785 is 587654776.

It is a Cunningham number, because it is equal to 26028²+1.

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 243859456 + 433597329 = 15616^2 + 20823^2 .

It is a cyclic number.

It is not a de Polignac number, because 677456785 - 2⁵ = 677456753 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67745674 + ... + 67745683.

It is an arithmetic number, because the mean of its divisors is an integer number (203237037).

Almost surely, 2^677456785 is an apocalyptic number.

It is an amenable number.

677456785 is a deficient number, since it is larger than the sum of its proper divisors (135491363).

677456785 is a wasteful number, since it uses less digits than its factorization.

677456785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135491362.

The product of its digits is 9878400, while the sum is 55.

The square root of 677456785 is about 26028.0000192101. Note that the first 4 decimals coincide. The cubic root of 677456785 is about 878.2682822135.

The spelling of 677456785 in words is "six hundred seventy-seven million, four hundred fifty-six thousand, seven hundred eighty-five".