26664644 has 12 divisors (see below), whose sum is σ = 47748624. Its totient is φ = 13022184.

The previous prime is 26664643. The next prime is 26664683. The reversal of 26664644 is 44646662.

It is a super-2 number, since 2×26664644² = 1422006479293472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26664598 and 26664607.

It is not an unprimeable number, because it can be changed into a prime (26664641) 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, 77342 + ... + 77685.

It is an arithmetic number, because the mean of its divisors is an integer number (3979052).

Almost surely, 2^26664644 is an apocalyptic number.

It is an amenable number.

26664644 is a deficient number, since it is larger than the sum of its proper divisors (21083980).

26664644 is a wasteful number, since it uses less digits than its factorization.

26664644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155074 (or 155072 counting only the distinct ones).

The product of its digits is 165888, while the sum is 38.

The square root of 26664644 is about 5163.7819473715. The cubic root of 26664644 is about 298.7527625895.

The spelling of 26664644 in words is "twenty-six million, six hundred sixty-four thousand, six hundred forty-four".