26440687872 has 144 divisors (see below), whose sum is σ = 78789332160. Its totient is φ = 8745984000.

The previous prime is 26440687841. The next prime is 26440687891. The reversal of 26440687872 is 27878604462.

It is a happy number.

26440687872 is a `hidden beast` number, since 2 + 6 + 440 + 68 + 78 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 890872 + ... + 920072.

It is an arithmetic number, because the mean of its divisors is an integer number (547148140).

Almost surely, 2^26440687872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26440687872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39394666080).

26440687872 is an abundant number, since it is smaller than the sum of its proper divisors (52348644288).

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

26440687872 is a wasteful number, since it uses less digits than its factorization.

26440687872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29357 (or 29337 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 54.

The spelling of 26440687872 in words is "twenty-six billion, four hundred forty million, six hundred eighty-seven thousand, eight hundred seventy-two".