2666638 has 8 divisors (see below), whose sum is σ = 4307688. Its totient is φ = 1230744.

The previous prime is 2666633. The next prime is 2666641. The reversal of 2666638 is 8366662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2666638² = 14221916446088, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2666597 and 2666606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666633) 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, 51256 + ... + 51307.

It is an arithmetic number, because the mean of its divisors is an integer number (538461).

2^2666638 is an apocalyptic number.

2666638 is a deficient number, since it is larger than the sum of its proper divisors (1641050).

2666638 is a wasteful number, since it uses less digits than its factorization.

2666638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102578.

The product of its digits is 62208, while the sum is 37.

The square root of 2666638 is about 1632.9843844936. The cubic root of 2666638 is about 138.6717579594.

The spelling of 2666638 in words is "two million, six hundred sixty-six thousand, six hundred thirty-eight".