26561900 has 18 divisors (see below), whose sum is σ = 57639540. Its totient is φ = 10624720.

The previous prime is 26561879. The next prime is 26561929. The reversal of 26561900 is 916562.

It is a super-2 number, since 2×26561900² = 1411069063220000, which contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 132710 + ... + 132909.

Almost surely, 2^26561900 is an apocalyptic number.

26561900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26561900 is an abundant number, since it is smaller than the sum of its proper divisors (31077640).

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

26561900 is a wasteful number, since it uses less digits than its factorization.

26561900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265633 (or 265626 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 26561900 is about 5153.8238231434. The cubic root of 26561900 is about 298.3685514083.

The spelling of 26561900 in words is "twenty-six million, five hundred sixty-one thousand, nine hundred".