2566440 has 48 divisors (see below), whose sum is σ = 8342100. Its totient is φ = 684288.

The previous prime is 2566433. The next prime is 2566469. The reversal of 2566440 is 446652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2566404 + 36 = 1602^2 + 6^2 .

It is a super-2 number, since 2×2566440² = 13173228547200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3205 + ... + 3924.

2^2566440 is an apocalyptic number.

2566440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2566440 is an abundant number, since it is smaller than the sum of its proper divisors (5775660).

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

2566440 is a wasteful number, since it uses less digits than its factorization.

2566440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7146 (or 7139 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 2566440 is about 1602.0112359157. The cubic root of 2566440 is about 136.9126905649.

The spelling of 2566440 in words is "two million, five hundred sixty-six thousand, four hundred forty".