26644640 has 48 divisors (see below), whose sum is σ = 68675040. Its totient is φ = 9688320.

The previous prime is 26644633. The next prime is 26644643. The reversal of 26644640 is 4644662.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 26644597 and 26644606.

It is not an unprimeable number, because it can be changed into a prime (26644643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5810 + ... + 9329.

It is an arithmetic number, because the mean of its divisors is an integer number (1430730).

Almost surely, 2^26644640 is an apocalyptic number.

26644640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26644640 is an abundant number, since it is smaller than the sum of its proper divisors (42030400).

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

26644640 is a wasteful number, since it uses less digits than its factorization.

26644640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15165 (or 15157 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 26644640 is about 5161.8446315247. The cubic root of 26644640 is about 298.6780351044.

The spelling of 26644640 in words is "twenty-six million, six hundred forty-four thousand, six hundred forty".