25640086 has 4 divisors (see below), whose sum is σ = 38460132. Its totient is φ = 12820042.

The previous prime is 25640081. The next prime is 25640171. The reversal of 25640086 is 68004652.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640081) by changing a digit.

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 as a sum of consecutive naturals, namely, 6410020 + ... + 6410023.

It is an arithmetic number, because the mean of its divisors is an integer number (9615033).

Almost surely, 2^25640086 is an apocalyptic number.

25640086 is a deficient number, since it is larger than the sum of its proper divisors (12820046).

25640086 is a wasteful number, since it uses less digits than its factorization.

25640086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12820045.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 25640086 is about 5063.6040524512. The cubic root of 25640086 is about 294.8762710085.

The spelling of 25640086 in words is "twenty-five million, six hundred forty thousand, eighty-six".