677125809 has 6 divisors (see below), whose sum is σ = 978070626. Its totient is φ = 451417200.

The previous prime is 677125807. The next prime is 677125817. The reversal of 677125809 is 908521776.

677125809 is a `hidden beast` number, since 67 + 7 + 1 + 2 + 580 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 590635809 + 86490000 = 24303^2 + 9300^2 .

It is not a de Polignac number, because 677125809 - 2¹ = 677125807 is a prime.

It is a super-2 number, since 2×677125809² = 916998722427808962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (677125807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37618092 + ... + 37618109.

It is an arithmetic number, because the mean of its divisors is an integer number (163011771).

Almost surely, 2^677125809 is an apocalyptic number.

It is an amenable number.

677125809 is a deficient number, since it is larger than the sum of its proper divisors (300944817).

677125809 is a wasteful number, since it uses less digits than its factorization.

677125809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75236207 (or 75236204 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 677125809 is about 26021.6411665367. The cubic root of 677125809 is about 878.1252309857.

The spelling of 677125809 in words is "six hundred seventy-seven million, one hundred twenty-five thousand, eight hundred nine".