25532440 has 32 divisors (see below), whose sum is σ = 57620160. Its totient is φ = 10182400.

The previous prime is 25532431. The next prime is 25532443. The reversal of 25532440 is 4423552.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25532443) 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, 16500 + ... + 17980.

It is an arithmetic number, because the mean of its divisors is an integer number (1800630).

Almost surely, 2^25532440 is an apocalyptic number.

25532440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25532440 is an abundant number, since it is smaller than the sum of its proper divisors (32087720).

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

25532440 is a wasteful number, since it uses less digits than its factorization.

25532440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923 (or 1919 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 25532440 is about 5052.9634869055. The cubic root of 25532440 is about 294.4630277685.

Adding to 25532440 its reverse (4423552), we get a palindrome (29955992).

The spelling of 25532440 in words is "twenty-five million, five hundred thirty-two thousand, four hundred forty".