2557685 has 24 divisors (see below), whose sum is σ = 3520440. Its totient is φ = 1772928.

The previous prime is 2557673. The next prime is 2557691. The reversal of 2557685 is 5867552.

It can be written as a sum of positive squares in 4 ways, for example, as 130321 + 2427364 = 361^2 + 1558^2 .

It is not a de Polignac number, because 2557685 - 2¹⁰ = 2556661 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23411 + ... + 23519.

It is an arithmetic number, because the mean of its divisors is an integer number (146685).

2^2557685 is an apocalyptic number.

It is an amenable number.

2557685 is a deficient number, since it is larger than the sum of its proper divisors (962755).

2557685 is a wasteful number, since it uses less digits than its factorization.

2557685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 146 counting only the distinct ones).

The product of its digits is 84000, while the sum is 38.

The square root of 2557685 is about 1599.2763988754. The cubic root of 2557685 is about 136.7568279408.

The spelling of 2557685 in words is "two million, five hundred fifty-seven thousand, six hundred eighty-five".