25278890 has 32 divisors (see below), whose sum is σ = 56004480. Its totient is φ = 8000064.

The previous prime is 25278889. The next prime is 25278901. The reversal of 25278890 is 9887252.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12980 + ... + 14799.

It is an arithmetic number, because the mean of its divisors is an integer number (1750140).

Almost surely, 2^25278890 is an apocalyptic number.

25278890 is an abundant number, since it is smaller than the sum of its proper divisors (30725590).

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

25278890 is a wasteful number, since it uses less digits than its factorization.

25278890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27806.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 25278890 is about 5027.8116512057. The cubic root of 25278890 is about 293.4850612543.

The spelling of 25278890 in words is "twenty-five million, two hundred seventy-eight thousand, eight hundred ninety".