2557660 has 24 divisors (see below), whose sum is σ = 6138720. Its totient is φ = 876864.

The previous prime is 2557649. The next prime is 2557663. The reversal of 2557660 is 667552.

2557660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557663) 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, 8995 + ... + 9274.

It is an arithmetic number, because the mean of its divisors is an integer number (255780).

2^2557660 is an apocalyptic number.

2557660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2557660 is an abundant number, since it is smaller than the sum of its proper divisors (3581060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2557660 is a wasteful number, since it uses less digits than its factorization.

2557660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18285 (or 18283 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 2557660 is about 1599.2685828215. The cubic root of 2557660 is about 136.7563823644.

The spelling of 2557660 in words is "two million, five hundred fifty-seven thousand, six hundred sixty".