26665664 has 28 divisors (see below), whose sum is σ = 55702200. Its totient is φ = 12630528.

The previous prime is 26665663. The next prime is 26665669. The reversal of 26665664 is 46656662.

It is a super-2 number, since 2×26665664² = 1422115273121792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26665663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9749 + ... + 12180.

Almost surely, 2^26665664 is an apocalyptic number.

It is an amenable number.

26665664 is an abundant number, since it is smaller than the sum of its proper divisors (29036536).

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

26665664 is a wasteful number, since it uses less digits than its factorization.

26665664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21960 (or 21950 counting only the distinct ones).

The product of its digits is 311040, while the sum is 41.

The square root of 26665664 is about 5163.8807112481. The cubic root of 26665664 is about 298.7565719276.

It can be divided in two parts, 2 and 6665664, that added together give a palindrome (6665666).

The spelling of 26665664 in words is "twenty-six million, six hundred sixty-five thousand, six hundred sixty-four".