26643140 has 24 divisors (see below), whose sum is σ = 56450520. Its totient is φ = 10562048.

The previous prime is 26643139. The next prime is 26643143. The reversal of 26643140 is 4134662.

It can be written as a sum of positive squares in 4 ways, for example, as 2515396 + 24127744 = 1586^2 + 4912^2 .

It is not an unprimeable number, because it can be changed into a prime (26643143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3635 + ... + 8154.

It is an arithmetic number, because the mean of its divisors is an integer number (2352105).

Almost surely, 2^26643140 is an apocalyptic number.

26643140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26643140 is an abundant number, since it is smaller than the sum of its proper divisors (29807380).

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

26643140 is a wasteful number, since it uses less digits than its factorization.

26643140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11911 (or 11909 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 26643140 is about 5161.6993325842. The cubic root of 26643140 is about 298.6724301565.

The spelling of 26643140 in words is "twenty-six million, six hundred forty-three thousand, one hundred forty".