2665638 has 12 divisors (see below), whose sum is σ = 5775588. Its totient is φ = 888540.

The previous prime is 2665627. The next prime is 2665667. The reversal of 2665638 is 8365662.

It is a d-powerful number, because it can be written as 2¹³ + 6³ + 6⁷ + 5³ + 6⁷ + 3⁴ + 8⁷ .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74028 + ... + 74063.

It is an arithmetic number, because the mean of its divisors is an integer number (481299).

2^2665638 is an apocalyptic number.

2665638 is an abundant number, since it is smaller than the sum of its proper divisors (3109950).

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

2665638 is a wasteful number, since it uses less digits than its factorization.

2665638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148099 (or 148096 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 2665638 is about 1632.6781679192. The cubic root of 2665638 is about 138.6544216361.

The spelling of 2665638 in words is "two million, six hundred sixty-five thousand, six hundred thirty-eight".