26388890 has 48 divisors (see below), whose sum is σ = 52945704. Its totient is φ = 9461760.

The previous prime is 26388883. The next prime is 26388899. The reversal of 26388890 is 9888362.

It can be written as a sum of positive squares in 4 ways, for example, as 9554281 + 16834609 = 3091^2 + 4103^2 .

It is not an unprimeable number, because it can be changed into a prime (26388899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136634 + ... + 136826.

Almost surely, 2^26388890 is an apocalyptic number.

26388890 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

26388890 is a wasteful number, since it uses less digits than its factorization.

26388890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 26388890 is about 5137.0117772884. The cubic root of 26388890 is about 297.7193354632.

The spelling of 26388890 in words is "twenty-six million, three hundred eighty-eight thousand, eight hundred ninety".