26661240 has 96 divisors (see below), whose sum is σ = 89481600. Its totient is φ = 6877440.

The previous prime is 26661233. The next prime is 26661259. The reversal of 26661240 is 4216662.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9966 + ... + 12354.

It is an arithmetic number, because the mean of its divisors is an integer number (932100).

Almost surely, 2^26661240 is an apocalyptic number.

26661240 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 26661240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44740800).

26661240 is an abundant number, since it is smaller than the sum of its proper divisors (62820360).

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

26661240 is a wasteful number, since it uses less digits than its factorization.

26661240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2437 (or 2430 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 26661240 is about 5163.4523334684. The cubic root of 26661240 is about 298.7400491542.

The spelling of 26661240 in words is "twenty-six million, six hundred sixty-one thousand, two hundred forty".