2564660 has 36 divisors (see below), whose sum is σ = 6267492. Its totient is φ = 878976.

The previous prime is 2564657. The next prime is 2564663. The reversal of 2564660 is 664652.

It is an interprime number because it is at equal distance from previous prime (2564657) and next prime (2564663).

It can be written as a sum of positive squares in 2 ways, for example, as 1882384 + 682276 = 1372^2 + 826^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329 + ... + 2288.

It is an arithmetic number, because the mean of its divisors is an integer number (174097).

2^2564660 is an apocalyptic number.

2564660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2564660 is an abundant number, since it is smaller than the sum of its proper divisors (3702832).

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

2564660 is a wasteful number, since it uses less digits than its factorization.

2564660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640 (or 2631 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 2564660 is about 1601.4555878950. The cubic root of 2564660 is about 136.8810305024.

The spelling of 2564660 in words is "two million, five hundred sixty-four thousand, six hundred sixty".