26555640 has 64 divisors (see below), whose sum is σ = 81833760. Its totient is φ = 6888960.

The previous prime is 26555609. The next prime is 26555647. The reversal of 26555640 is 4655562.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26555647) 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, 1450 + ... + 7430.

Almost surely, 2^26555640 is an apocalyptic number.

26555640 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 26555640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40916880).

26555640 is an abundant number, since it is smaller than the sum of its proper divisors (55278120).

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

26555640 is a wasteful number, since it uses less digits than its factorization.

26555640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6032 (or 6028 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 26555640 is about 5153.2164712925. The cubic root of 26555640 is about 298.3451101399.

The spelling of 26555640 in words is "twenty-six million, five hundred fifty-five thousand, six hundred forty".