2640885 has 32 divisors (see below), whose sum is σ = 4717440. Its totient is φ = 1252608.

The previous prime is 2640881. The next prime is 2640889. The reversal of 2640885 is 5880462.

2640885 = 73² + 74² + ... + 202².

It is an interprime number because it is at equal distance from previous prime (2640881) and next prime (2640889).

It is not a de Polignac number, because 2640885 - 2² = 2640881 is a prime.

It is a d-powerful number, because it can be written as 2¹⁰ + 6⁷ + 4 + 0 + 8⁶ + 8⁷ + 5⁴ .

2640885 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640881) 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, 5422 + ... + 5888.

It is an arithmetic number, because the mean of its divisors is an integer number (147420).

2^2640885 is an apocalyptic number.

It is an amenable number.

2640885 is a deficient number, since it is larger than the sum of its proper divisors (2076555).

2640885 is a wasteful number, since it uses less digits than its factorization.

2640885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 2640885 is about 1625.0799980309. The cubic root of 2640885 is about 138.2239066237.

The spelling of 2640885 in words is "two million, six hundred forty thousand, eight hundred eighty-five".