2561766 has 16 divisors (see below), whose sum is σ = 5140800. Its totient is φ = 851048.

The previous prime is 2561761. The next prime is 2561771. The reversal of 2561766 is 6671652.

It is an interprime number because it is at equal distance from previous prime (2561761) and next prime (2561771).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2005 + ... + 3023.

It is an arithmetic number, because the mean of its divisors is an integer number (321300).

2^2561766 is an apocalyptic number.

2561766 is an abundant number, since it is smaller than the sum of its proper divisors (2579034).

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

2561766 is a wasteful number, since it uses less digits than its factorization.

2561766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443.

The product of its digits is 15120, while the sum is 33.

The square root of 2561766 is about 1600.5517798559. The cubic root of 2561766 is about 136.8295249361.

The spelling of 2561766 in words is "two million, five hundred sixty-one thousand, seven hundred sixty-six".