25645320 has 48 divisors (see below), whose sum is σ = 83348460. Its totient is φ = 6838656.

The previous prime is 25645303. The next prime is 25645331. The reversal of 25645320 is 2354652.

It can be written as a sum of positive squares in 2 ways, for example, as 22638564 + 3006756 = 4758^2 + 1734^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35259 + ... + 35978.

Almost surely, 2^25645320 is an apocalyptic number.

25645320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25645320 is an abundant number, since it is smaller than the sum of its proper divisors (57703140).

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

25645320 is a wasteful number, since it uses less digits than its factorization.

25645320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71254 (or 71247 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 25645320 is about 5064.1208516385. The cubic root of 25645320 is about 294.8963343499.

Adding to 25645320 its reverse (2354652), we get a palindrome (27999972).

The spelling of 25645320 in words is "twenty-five million, six hundred forty-five thousand, three hundred twenty".