2640556 has 12 divisors (see below), whose sum is σ = 4684792. Its totient is φ = 1302048.

The previous prime is 2640551. The next prime is 2640571. The reversal of 2640556 is 6550462.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2640551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4230 + ... + 4813.

2^2640556 is an apocalyptic number.

It is an amenable number.

2640556 is a deficient number, since it is larger than the sum of its proper divisors (2044236).

2640556 is a wasteful number, since it uses less digits than its factorization.

2640556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9120 (or 9118 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 2640556 is about 1624.9787690921. The cubic root of 2640556 is about 138.2181664326.

The spelling of 2640556 in words is "two million, six hundred forty thousand, five hundred fifty-six".