25643332 has 48 divisors (see below), whose sum is σ = 53286912. Its totient is φ = 10644480.

The previous prime is 25643329. The next prime is 25643333. The reversal of 25643332 is 23334652.

It is a self number, because there is not a number n which added to its sum of digits gives 25643332.

It is not an unprimeable number, because it can be changed into a prime (25643333) 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, 72468 + ... + 72820.

It is an arithmetic number, because the mean of its divisors is an integer number (1110144).

Almost surely, 2^25643332 is an apocalyptic number.

25643332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

25643332 is an abundant number, since it is smaller than the sum of its proper divisors (27643580).

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

25643332 is a wasteful number, since it uses less digits than its factorization.

25643332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508 (or 506 counting only the distinct ones).

The product of its digits is 12960, while the sum is 28.

The square root of 25643332 is about 5063.9245649990. The cubic root of 25643332 is about 294.8887141283. Note that the first 3 decimals are identical.

Adding to 25643332 its reverse (23334652), we get a palindrome (48977984).

The spelling of 25643332 in words is "twenty-five million, six hundred forty-three thousand, three hundred thirty-two".