25730556 has 12 divisors (see below), whose sum is σ = 60037992. Its totient is φ = 8576848.

The previous prime is 25730539. The next prime is 25730561. The reversal of 25730556 is 65503752.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 1072095 + ... + 1072118.

It is an arithmetic number, because the mean of its divisors is an integer number (5003166).

Almost surely, 2^25730556 is an apocalyptic number.

It is an amenable number.

25730556 is an abundant number, since it is smaller than the sum of its proper divisors (34307436).

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

25730556 is a wasteful number, since it uses less digits than its factorization.

25730556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144220 (or 2144218 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 33.

The square root of 25730556 is about 5072.5295464886. The cubic root of 25730556 is about 295.2226835339. Note that the first 3 decimals are identical.

The spelling of 25730556 in words is "twenty-five million, seven hundred thirty thousand, five hundred fifty-six".