25906890 has 32 divisors (see below), whose sum is σ = 63109440. Its totient is φ = 6804864.

The previous prime is 25906871. The next prime is 25906913. The reversal of 25906890 is 9860952.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4435 + ... + 8454.

It is an arithmetic number, because the mean of its divisors is an integer number (1972170).

Almost surely, 2^25906890 is an apocalyptic number.

25906890 is an abundant number, since it is smaller than the sum of its proper divisors (37202550).

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

25906890 is a wasteful number, since it uses less digits than its factorization.

25906890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12966.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 25906890 is about 5089.8811381014. The cubic root of 25906890 is about 295.8955453813.

It can be divided in two parts, 25906 and 890, that added together give a triangular number (26796 = T₂₃₁).

The spelling of 25906890 in words is "twenty-five million, nine hundred six thousand, eight hundred ninety".