26685640 has 16 divisors (see below), whose sum is σ = 60042780. Its totient is φ = 10674240.

The previous prime is 26685623. The next prime is 26685643. The reversal of 26685640 is 4658662.

It can be written as a sum of positive squares in 2 ways, for example, as 24980004 + 1705636 = 4998^2 + 1306^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 26685640.

It is not an unprimeable number, because it can be changed into a prime (26685643) 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 3 ways as a sum of consecutive naturals, for example, 333531 + ... + 333610.

Almost surely, 2^26685640 is an apocalyptic number.

26685640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26685640 is an abundant number, since it is smaller than the sum of its proper divisors (33357140).

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

26685640 is a wasteful number, since it uses less digits than its factorization.

26685640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667152 (or 667148 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 26685640 is about 5165.8145533885. The cubic root of 26685640 is about 298.8311556275.

The spelling of 26685640 in words is "twenty-six million, six hundred eighty-five thousand, six hundred forty".