25555890 has 16 divisors (see below), whose sum is σ = 61334208. Its totient is φ = 6814896.

The previous prime is 25555883. The next prime is 25555903. The reversal of 25555890 is 9855552.

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, 425902 + ... + 425961.

It is an arithmetic number, because the mean of its divisors is an integer number (3833388).

Almost surely, 2^25555890 is an apocalyptic number.

25555890 is an abundant number, since it is smaller than the sum of its proper divisors (35778318).

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

25555890 is a wasteful number, since it uses less digits than its factorization.

25555890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851873.

The product of its (nonzero) digits is 90000, while the sum is 39.

The square root of 25555890 is about 5055.2833748466. The cubic root of 25555890 is about 294.5531490037.

The spelling of 25555890 in words is "twenty-five million, five hundred fifty-five thousand, eight hundred ninety".