26980640 has 24 divisors (see below), whose sum is σ = 63742140. Its totient is φ = 10792192.

The previous prime is 26980621. The next prime is 26980697. The reversal of 26980640 is 4608962.

It can be written as a sum of positive squares in 2 ways, for example, as 25120144 + 1860496 = 5012^2 + 1364^2 .

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 26980640.

It is an unprimeable number.

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, 84155 + ... + 84474.

Almost surely, 2^26980640 is an apocalyptic number.

26980640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26980640 is an abundant number, since it is smaller than the sum of its proper divisors (36761500).

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

26980640 is a wasteful number, since it uses less digits than its factorization.

26980640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168644 (or 168636 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 26980640 is about 5194.2891717732. The cubic root of 26980640 is about 299.9282791514.

The spelling of 26980640 in words is "twenty-six million, nine hundred eighty thousand, six hundred forty".