26289864 has 24 divisors (see below), whose sum is σ = 71201910. Its totient is φ = 8763264.

The previous prime is 26289811. The next prime is 26289877. The reversal of 26289864 is 46898262.

It can be written as a sum of positive squares in only one way, i.e., 23912100 + 2377764 = 4890^2 + 1542^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 182497 + ... + 182640.

Almost surely, 2^26289864 is an apocalyptic number.

26289864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

26289864 is an abundant number, since it is smaller than the sum of its proper divisors (44912046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26289864 is a wasteful number, since it uses less digits than its factorization.

26289864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365149 (or 365142 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 26289864 is about 5127.3642351602. The cubic root of 26289864 is about 297.3464650415.

The spelling of 26289864 in words is "twenty-six million, two hundred eighty-nine thousand, eight hundred sixty-four".