677838509 has 6 divisors (see below), whose sum is σ = 715392270. Its totient is φ = 642162456.

The previous prime is 677838503. The next prime is 677838607. The reversal of 677838509 is 905838776.

It can be written as a sum of positive squares in only one way, i.e., 653058025 + 24780484 = 25555^2 + 4978^2 .

It is not a de Polignac number, because 677838509 - 2²⁰ = 676789933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (677838503) 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, 938474 + ... + 939195.

It is an arithmetic number, because the mean of its divisors is an integer number (119232045).

Almost surely, 2^677838509 is an apocalyptic number.

It is an amenable number.

677838509 is a deficient number, since it is larger than the sum of its proper divisors (37553761).

677838509 is a wasteful number, since it uses less digits than its factorization.

677838509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877707 (or 1877688 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 53.

The square root of 677838509 is about 26035.3319356600. The cubic root of 677838509 is about 878.4332094041.

The spelling of 677838509 in words is "six hundred seventy-seven million, eight hundred thirty-eight thousand, five hundred nine".