26561540 has 12 divisors (see below), whose sum is σ = 55779276. Its totient is φ = 10624608.

The previous prime is 26561539. The next prime is 26561551. The reversal of 26561540 is 4516562.

It can be written as a sum of positive squares in 2 ways, for example, as 3655744 + 22905796 = 1912^2 + 4786^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664019 + ... + 664058.

It is an arithmetic number, because the mean of its divisors is an integer number (4648273).

Almost surely, 2^26561540 is an apocalyptic number.

26561540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26561540 is an abundant number, since it is smaller than the sum of its proper divisors (29217736).

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

26561540 is a wasteful number, since it uses less digits than its factorization.

26561540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328086 (or 1328084 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 26561540 is about 5153.7888975006. The cubic root of 26561540 is about 298.3672034480.

The spelling of 26561540 in words is "twenty-six million, five hundred sixty-one thousand, five hundred forty".