25904040 has 64 divisors (see below), whose sum is σ = 78321600. Its totient is φ = 6853632.

The previous prime is 25904027. The next prime is 25904041. The reversal of 25904040 is 4040952.

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 25904040.

It is not an unprimeable number, because it can be changed into a prime (25904041) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15904 + ... + 17456.

It is an arithmetic number, because the mean of its divisors is an integer number (1223775).

Almost surely, 2^25904040 is an apocalyptic number.

25904040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25904040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39160800).

25904040 is an abundant number, since it is smaller than the sum of its proper divisors (52417560).

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

25904040 is a wasteful number, since it uses less digits than its factorization.

25904040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706 (or 1702 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 25904040 is about 5089.6011631561. The cubic root of 25904040 is about 295.8846945583.

Adding to 25904040 its reverse (4040952), we get a palindrome (29944992).

The spelling of 25904040 in words is "twenty-five million, nine hundred four thousand, forty".