26420638 has 8 divisors (see below), whose sum is σ = 39744288. Its totient is φ = 13172544.

The previous prime is 26420623. The next prime is 26420651. The reversal of 26420638 is 83602462.

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

It is a super-2 number, since 2×26420638² = 1396100224654088, which contains 22 as substring.

It is a congruent number.

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, 18006 + ... + 19417.

It is an arithmetic number, because the mean of its divisors is an integer number (4968036).

Almost surely, 2^26420638 is an apocalyptic number.

26420638 is a deficient number, since it is larger than the sum of its proper divisors (13323650).

26420638 is a wasteful number, since it uses less digits than its factorization.

26420638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37778.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 26420638 is about 5140.1009717709. The cubic root of 26420638 is about 297.8386812117.

It can be divided in two parts, 264 and 20638, that added together give a palindrome (20902).

The spelling of 26420638 in words is "twenty-six million, four hundred twenty thousand, six hundred thirty-eight".