2557645 has 8 divisors (see below), whose sum is σ = 3106656. Its totient is φ = 2021136.

The previous prime is 2557631. The next prime is 2557649. The reversal of 2557645 is 5467552.

2557645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2557645 - 2⁵ = 2557613 is a prime.

It is a super-3 number, since 3×2557645³ = 50192872189233333375, which contains 333 as substring.

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 2557645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2667 + ... + 3496.

It is an arithmetic number, because the mean of its divisors is an integer number (388332).

2^2557645 is an apocalyptic number.

It is an amenable number.

2557645 is a deficient number, since it is larger than the sum of its proper divisors (549011).

2557645 is an equidigital number, since it uses as much as digits as its factorization.

2557645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6251.

The product of its digits is 42000, while the sum is 34.

The square root of 2557645 is about 1599.2638931709. The cubic root of 2557645 is about 136.7561150172.

The spelling of 2557645 in words is "two million, five hundred fifty-seven thousand, six hundred forty-five".