26665642 has 8 divisors (see below), whose sum is σ = 41288832. Its totient is φ = 12902700.

The previous prime is 26665631. The next prime is 26665643. The reversal of 26665642 is 24656662.

It is a happy number.

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

It is a super-2 number, since 2×26665642² = 1422112926544328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26665643) by changing a digit.

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, 214984 + ... + 215107.

It is an arithmetic number, because the mean of its divisors is an integer number (5161104).

Almost surely, 2^26665642 is an apocalyptic number.

26665642 is a deficient number, since it is larger than the sum of its proper divisors (14623190).

26665642 is a wasteful number, since it uses less digits than its factorization.

26665642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430124.

The product of its digits is 103680, while the sum is 37.

The square root of 26665642 is about 5163.8785810668. The cubic root of 26665642 is about 298.7564897664.

The spelling of 26665642 in words is "twenty-six million, six hundred sixty-five thousand, six hundred forty-two".