25643590 has 32 divisors (see below), whose sum is σ = 54183744. Its totient is φ = 8553600.

The previous prime is 25643587. The next prime is 25643593. The reversal of 25643590 is 9534652.

It is an interprime number because it is at equal distance from previous prime (25643587) and next prime (25643593).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25643593) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2361 + ... + 7540.

It is an arithmetic number, because the mean of its divisors is an integer number (1693242).

Almost surely, 2^25643590 is an apocalyptic number.

25643590 is an abundant number, since it is smaller than the sum of its proper divisors (28540154).

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

25643590 is a wasteful number, since it uses less digits than its factorization.

25643590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9952.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 25643590 is about 5063.9500392480. The cubic root of 25643590 is about 294.8897030928.

The spelling of 25643590 in words is "twenty-five million, six hundred forty-three thousand, five hundred ninety".