26287440 has 120 divisors (see below), whose sum is σ = 86795040. Its totient is φ = 6580224.

The previous prime is 26287433. The next prime is 26287441. The reversal of 26287440 is 4478262.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26287441) 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, 69171 + ... + 69549.

It is an arithmetic number, because the mean of its divisors is an integer number (723292).

Almost surely, 2^26287440 is an apocalyptic number.

26287440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26287440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43397520).

26287440 is an abundant number, since it is smaller than the sum of its proper divisors (60507600).

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

26287440 is a wasteful number, since it uses less digits than its factorization.

26287440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 26287440 is about 5127.1278509513. The cubic root of 26287440 is about 297.3373260315.

The spelling of 26287440 in words is "twenty-six million, two hundred eighty-seven thousand, four hundred forty".