25643432 has 8 divisors (see below), whose sum is σ = 48081450. Its totient is φ = 12821712.

The previous prime is 25643419. The next prime is 25643441. The reversal of 25643432 is 23434652.

It can be written as a sum of positive squares in only one way, i.e., 23290276 + 2353156 = 4826^2 + 1534^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 25643395 and 25643404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1602707 + ... + 1602722.

Almost surely, 2^25643432 is an apocalyptic number.

It is an amenable number.

25643432 is a deficient number, since it is larger than the sum of its proper divisors (22438018).

25643432 is a wasteful number, since it uses less digits than its factorization.

25643432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3205435 (or 3205431 counting only the distinct ones).

The product of its digits is 17280, while the sum is 29.

The square root of 25643432 is about 5063.9344387541. The cubic root of 25643432 is about 294.8890974487.

The spelling of 25643432 in words is "twenty-five million, six hundred forty-three thousand, four hundred thirty-two".