25640555 has 8 divisors (see below), whose sum is σ = 30973344. Its totient is φ = 20376000.

The previous prime is 25640543. The next prime is 25640579. The reversal of 25640555 is 55504652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25640555 - 2⁸ = 25640299 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16226 + ... + 17735.

It is an arithmetic number, because the mean of its divisors is an integer number (3871668).

Almost surely, 2^25640555 is an apocalyptic number.

25640555 is a deficient number, since it is larger than the sum of its proper divisors (5332789).

25640555 is a wasteful number, since it uses less digits than its factorization.

25640555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34117.

The product of its (nonzero) digits is 30000, while the sum is 32.

The square root of 25640555 is about 5063.6503631274. The cubic root of 25640555 is about 294.8780689241.

The spelling of 25640555 in words is "twenty-five million, six hundred forty thousand, five hundred fifty-five".