26869840 has 80 divisors (see below), whose sum is σ = 65406528. Its totient is φ = 10257408.

The previous prime is 26869837. The next prime is 26869849. The reversal of 26869840 is 4896862.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26869849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251067 + ... + 251173.

Almost surely, 2^26869840 is an apocalyptic number.

26869840 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 26869840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32703264).

26869840 is an abundant number, since it is smaller than the sum of its proper divisors (38536688).

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

26869840 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (26869839) it forms an eRAP, since the sums of their prime factors are consecutive (235 and 236).

26869840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 26869840 is about 5183.6126398488. The cubic root of 26869840 is about 299.5171491932.

The spelling of 26869840 in words is "twenty-six million, eight hundred sixty-nine thousand, eight hundred forty".