2556645 has 32 divisors (see below), whose sum is σ = 5037312. Its totient is φ = 1078272.

The previous prime is 2556641. The next prime is 2556661. The reversal of 2556645 is 5466552.

It is a happy number.

It is not a de Polignac number, because 2556645 - 2² = 2556641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 429 + ... + 2301.

It is an arithmetic number, because the mean of its divisors is an integer number (157416).

2^2556645 is an apocalyptic number.

It is an amenable number.

2556645 is a deficient number, since it is larger than the sum of its proper divisors (2480667).

2556645 is a wasteful number, since it uses less digits than its factorization.

2556645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901.

The product of its digits is 36000, while the sum is 33.

The square root of 2556645 is about 1598.9512187681. The cubic root of 2556645 is about 136.7382895121.

The spelling of 2556645 in words is "two million, five hundred fifty-six thousand, six hundred forty-five".