26639140 has 48 divisors (see below), whose sum is σ = 64249920. Its totient is φ = 9175680.

The previous prime is 26639111. The next prime is 26639143. The reversal of 26639140 is 4193662.

It is not an unprimeable number, because it can be changed into a prime (26639143) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 994 + ... + 7366.

It is an arithmetic number, because the mean of its divisors is an integer number (1338540).

Almost surely, 2^26639140 is an apocalyptic number.

26639140 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 26639140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32124960).

26639140 is an abundant number, since it is smaller than the sum of its proper divisors (37610780).

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

26639140 is a wasteful number, since it uses less digits than its factorization.

26639140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6412 (or 6410 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 26639140 is about 5161.3118487454. The cubic root of 26639140 is about 298.6574826001.

The spelling of 26639140 in words is "twenty-six million, six hundred thirty-nine thousand, one hundred forty".