25555578 has 8 divisors (see below), whose sum is σ = 51111168. Its totient is φ = 8518524.

The previous prime is 25555561. The next prime is 25555597. The reversal of 25555578 is 87555552.

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

25555578 is an admirable number.

It is a plaindrome in base 10.

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, 2129626 + ... + 2129637.

It is an arithmetic number, because the mean of its divisors is an integer number (6388896).

Almost surely, 2^25555578 is an apocalyptic number.

25555578 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25555578 is a wasteful number, since it uses less digits than its factorization.

25555578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259268.

The product of its digits is 350000, while the sum is 42.

The square root of 25555578 is about 5055.2525159481. The cubic root of 25555578 is about 294.5519503112.

The spelling of 25555578 in words is "twenty-five million, five hundred fifty-five thousand, five hundred seventy-eight".