26386890 has 64 divisors (see below), whose sum is σ = 69258240. Its totient is φ = 6405120.

The previous prime is 26386889. The next prime is 26386909. The reversal of 26386890 is 9868362.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 14976 + ... + 16644.

It is an arithmetic number, because the mean of its divisors is an integer number (1082160).

Almost surely, 2^26386890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26386890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34629120).

26386890 is an abundant number, since it is smaller than the sum of its proper divisors (42871350).

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

26386890 is a wasteful number, since it uses less digits than its factorization.

26386890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 26386890 is about 5136.8171078986. The cubic root of 26386890 is about 297.7118139429.

It can be divided in two parts, 263 and 86890, that added together give a triangular number (87153 = T₄₁₇).

The spelling of 26386890 in words is "twenty-six million, three hundred eighty-six thousand, eight hundred ninety".