26728840 has 16 divisors (see below), whose sum is σ = 60139980. Its totient is φ = 10691520.

The previous prime is 26728831. The next prime is 26728859. The reversal of 26728840 is 4882762.

It can be written as a sum of positive squares in 2 ways, for example, as 25341156 + 1387684 = 5034^2 + 1178^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 26728840.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 334071 + ... + 334150.

Almost surely, 2^26728840 is an apocalyptic number.

26728840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26728840 is an abundant number, since it is smaller than the sum of its proper divisors (33411140).

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

26728840 is a wasteful number, since it uses less digits than its factorization.

26728840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668232 (or 668228 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 26728840 is about 5169.9941972888. The cubic root of 26728840 is about 298.9923227821.

The spelling of 26728840 in words is "twenty-six million, seven hundred twenty-eight thousand, eight hundred forty".