25820643 has 16 divisors (see below), whose sum is σ = 35748000. Its totient is φ = 16558080.

The previous prime is 25820623. The next prime is 25820659. The reversal of 25820643 is 34602852.

It is not a de Polignac number, because 25820643 - 2¹² = 25816547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25820643.

It is not an unprimeable number, because it can be changed into a prime (25820623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38733 + ... + 39393.

It is an arithmetic number, because the mean of its divisors is an integer number (2234250).

Almost surely, 2^25820643 is an apocalyptic number.

25820643 is a deficient number, since it is larger than the sum of its proper divisors (9927357).

25820643 is a wasteful number, since it uses less digits than its factorization.

25820643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 25820643 is about 5081.4016767030. The cubic root of 25820643 is about 295.5668236220.

The spelling of 25820643 in words is "twenty-five million, eight hundred twenty thousand, six hundred forty-three".