26384640 has 72 divisors (see below), whose sum is σ = 84278208. Its totient is φ = 7034880.

The previous prime is 26384599. The next prime is 26384641. The reversal of 26384640 is 4648362.

It is a super-2 number, since 2×26384640² = 1392298455859200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26384641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405 + ... + 7275.

Almost surely, 2^26384640 is an apocalyptic number.

26384640 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 26384640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42139104).

26384640 is an abundant number, since it is smaller than the sum of its proper divisors (57893568).

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

26384640 is an equidigital number, since it uses as much as digits as its factorization.

26384640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6895 (or 6881 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 26384640 is about 5136.5980960165. The cubic root of 26384640 is about 297.7033517783.

The spelling of 26384640 in words is "twenty-six million, three hundred eighty-four thousand, six hundred forty".