25043640 has 32 divisors (see below), whose sum is σ = 75131280. Its totient is φ = 6678272.

The previous prime is 25043639. The next prime is 25043647. The reversal of 25043640 is 4634052.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 25043640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25043647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104229 + ... + 104468.

Almost surely, 2^25043640 is an apocalyptic number.

25043640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25043640 is an abundant number, since it is smaller than the sum of its proper divisors (50087640).

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

25043640 is a wasteful number, since it uses less digits than its factorization.

25043640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208711 (or 208707 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 25043640 is about 5004.3620972108. The cubic root of 25043640 is about 292.5718137645.

Adding to 25043640 its reverse (4634052), we get a palindrome (29677692).

The spelling of 25043640 in words is "twenty-five million, forty-three thousand, six hundred forty".