26278664 has 8 divisors (see below), whose sum is σ = 49272510. Its totient is φ = 13139328.

The previous prime is 26278661. The next prime is 26278667. The reversal of 26278664 is 46687262.

It is an interprime number because it is at equal distance from previous prime (26278661) and next prime (26278667).

It can be written as a sum of positive squares in only one way, i.e., 21252100 + 5026564 = 4610^2 + 2242^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26278661) 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 as a sum of consecutive naturals, namely, 1642409 + ... + 1642424.

Almost surely, 2^26278664 is an apocalyptic number.

It is an amenable number.

26278664 is a deficient number, since it is larger than the sum of its proper divisors (22993846).

26278664 is a wasteful number, since it uses less digits than its factorization.

26278664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3284839 (or 3284835 counting only the distinct ones).

The product of its digits is 193536, while the sum is 41.

The square root of 26278664 is about 5126.2719397238. The cubic root of 26278664 is about 297.3042338931.

The spelling of 26278664 in words is "twenty-six million, two hundred seventy-eight thousand, six hundred sixty-four".