2661644 has 12 divisors (see below), whose sum is σ = 4714584. Its totient is φ = 1314624.

The previous prime is 2661643. The next prime is 2661647. The reversal of 2661644 is 4461662.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2661641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3677 + ... + 4340.

It is an arithmetic number, because the mean of its divisors is an integer number (392882).

2^2661644 is an apocalyptic number.

It is an amenable number.

2661644 is a deficient number, since it is larger than the sum of its proper divisors (2052940).

2661644 is a wasteful number, since it uses less digits than its factorization.

2661644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8104 (or 8102 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 2661644 is about 1631.4545657174. The cubic root of 2661644 is about 138.5851370877.

The spelling of 2661644 in words is "two million, six hundred sixty-one thousand, six hundred forty-four".