26666642 has 8 divisors (see below), whose sum is σ = 42352956. Its totient is φ = 12548992.

The previous prime is 26666621. The next prime is 26666663. The reversal of 26666642 is 24666662.

It is an interprime number because it is at equal distance from previous prime (26666621) and next prime (26666663).

It can be written as a sum of positive squares in 2 ways, for example, as 21335161 + 5331481 = 4619^2 + 2309^2 .

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

It is a super-2 number, since 2×26666642² = 1422219591112328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26666596 and 26666605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392123 + ... + 392190.

Almost surely, 2^26666642 is an apocalyptic number.

26666642 is a deficient number, since it is larger than the sum of its proper divisors (15686314).

26666642 is a wasteful number, since it uses less digits than its factorization.

26666642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784332.

The product of its digits is 124416, while the sum is 38.

The square root of 26666642 is about 5163.9754066029. The cubic root of 26666642 is about 298.7602243194.

The spelling of 26666642 in words is "twenty-six million, six hundred sixty-six thousand, six hundred forty-two".