25705890 has 192 divisors, whose sum is σ = 83721600. Its totient is φ = 5588352.

The previous prime is 25705871. The next prime is 25705903. The reversal of 25705890 is 9850752.

25705890 is a `hidden beast` number, since 2 + 5 + 70 + 589 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 383637 + ... + 383703.

It is an arithmetic number, because the mean of its divisors is an integer number (436050).

Almost surely, 2^25705890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25705890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41860800).

25705890 is an abundant number, since it is smaller than the sum of its proper divisors (58015710).

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

25705890 is a wasteful number, since it uses less digits than its factorization.

25705890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 25705890 is about 5070.0976321961. The cubic root of 25705890 is about 295.1283172501.

The spelling of 25705890 in words is "twenty-five million, seven hundred five thousand, eight hundred ninety".