25643532 has 24 divisors (see below), whose sum is σ = 61295472. Its totient is φ = 8339200.

The previous prime is 25643507. The next prime is 25643533. The reversal of 25643532 is 23534652.

It is a self number, because there is not a number n which added to its sum of digits gives 25643532.

It is not an unprimeable number, because it can be changed into a prime (25643533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25569 + ... + 26552.

It is an arithmetic number, because the mean of its divisors is an integer number (2553978).

Almost surely, 2^25643532 is an apocalyptic number.

It is an amenable number.

25643532 is an abundant number, since it is smaller than the sum of its proper divisors (35651940).

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

25643532 is a wasteful number, since it uses less digits than its factorization.

25643532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52169 (or 52167 counting only the distinct ones).

The product of its digits is 21600, while the sum is 30.

The square root of 25643532 is about 5063.9443124900. The cubic root of 25643532 is about 294.8894807680.

The spelling of 25643532 in words is "twenty-five million, six hundred forty-three thousand, five hundred thirty-two".