25643212 has 24 divisors (see below), whose sum is σ = 52012800. Its totient is φ = 10834320.

The previous prime is 25643173. The next prime is 25643227. The reversal of 25643212 is 21234652.

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 in 7 ways as a sum of consecutive naturals, for example, 4462 + ... + 8437.

It is an arithmetic number, because the mean of its divisors is an integer number (2167200).

Almost surely, 2^25643212 is an apocalyptic number.

It is an amenable number.

25643212 is an abundant number, since it is smaller than the sum of its proper divisors (26369588).

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

25643212 is a wasteful number, since it uses less digits than its factorization.

25643212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12981 (or 12979 counting only the distinct ones).

The product of its digits is 2880, while the sum is 25.

The square root of 25643212 is about 5063.9127164674. The cubic root of 25643212 is about 294.8882541426. Note that the first 3 decimals are identical.

Adding to 25643212 its reverse (21234652), we get a palindrome (46877864).

It can be divided in two parts, 2564 and 3212, that added together give a square (5776 = 76²).

The spelling of 25643212 in words is "twenty-five million, six hundred forty-three thousand, two hundred twelve".