25810642 has 16 divisors (see below), whose sum is σ = 45484992. Its totient is φ = 10829520.

The previous prime is 25810639. The next prime is 25810649. The reversal of 25810642 is 24601852.

It is a self number, because there is not a number n which added to its sum of digits gives 25810642.

It is not an unprimeable number, because it can be changed into a prime (25810649) 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 in 7 ways as a sum of consecutive naturals, for example, 44838 + ... + 45409.

It is an arithmetic number, because the mean of its divisors is an integer number (2842812).

Almost surely, 2^25810642 is an apocalyptic number.

25810642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

25810642 is a deficient number, since it is larger than the sum of its proper divisors (19674350).

25810642 is a wasteful number, since it uses less digits than its factorization.

25810642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90273.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 25810642 is about 5080.4175025287. The cubic root of 25810642 is about 295.5286584799.

The spelling of 25810642 in words is "twenty-five million, eight hundred ten thousand, six hundred forty-two".