2661638 has 16 divisors (see below), whose sum is σ = 4675104. Its totient is φ = 1112640.

The previous prime is 2661611. The next prime is 2661641. The reversal of 2661638 is 8361662.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1745 + ... + 2892.

It is an arithmetic number, because the mean of its divisors is an integer number (292194).

2^2661638 is an apocalyptic number.

2661638 is a deficient number, since it is larger than the sum of its proper divisors (2013466).

2661638 is a wasteful number, since it uses less digits than its factorization.

2661638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4687.

The product of its digits is 10368, while the sum is 32.

The square root of 2661638 is about 1631.4527268665. The cubic root of 2661638 is about 138.5850329527.

The spelling of 2661638 in words is "two million, six hundred sixty-one thousand, six hundred thirty-eight".