2557690 has 16 divisors (see below), whose sum is σ = 4626720. Its totient is φ = 1018000.

The previous prime is 2557673. The next prime is 2557691. The reversal of 2557690 is 967552.

It is a super-2 number, since 2×2557690² = 13083556272200, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹⁹ + 5⁵ + 5⁹ + 7⁵ + 6⁴ + 9⁵ + 0 .

It is not an unprimeable number, because it can be changed into a prime (2557691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2001 + ... + 3019.

It is an arithmetic number, because the mean of its divisors is an integer number (289170).

2^2557690 is an apocalyptic number.

2557690 is a deficient number, since it is larger than the sum of its proper divisors (2069030).

2557690 is a wasteful number, since it uses less digits than its factorization.

2557690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 2557690 is about 1599.2779620816. The cubic root of 2557690 is about 136.7569170557.

The spelling of 2557690 in words is "two million, five hundred fifty-seven thousand, six hundred ninety".