2563766 has 4 divisors (see below), whose sum is σ = 3845652. Its totient is φ = 1281882.

The previous prime is 2563763. The next prime is 2563777. The reversal of 2563766 is 6673652.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×2563766² = 13145792205512, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640940 + ... + 640943.

It is an arithmetic number, because the mean of its divisors is an integer number (961413).

2^2563766 is an apocalyptic number.

2563766 is a deficient number, since it is larger than the sum of its proper divisors (1281886).

2563766 is a wasteful number, since it uses less digits than its factorization.

2563766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281885.

The product of its digits is 45360, while the sum is 35.

The square root of 2563766 is about 1601.1764424947. The cubic root of 2563766 is about 136.8651237983.

The spelling of 2563766 in words is "two million, five hundred sixty-three thousand, seven hundred sixty-six".