25604040 has 256 divisors, whose sum is σ = 102021120. Its totient is φ = 4976640.

The previous prime is 25604027. The next prime is 25604063. The reversal of 25604040 is 4040652.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

25604040 is a modest number, since divided by 4040 gives 2560 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 25603998 and 25604016.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 156999 + ... + 157161.

It is an arithmetic number, because the mean of its divisors is an integer number (398520).

Almost surely, 2^25604040 is an apocalyptic number.

25604040 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 25604040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51010560).

25604040 is an abundant number, since it is smaller than the sum of its proper divisors (76417080).

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

25604040 is a wasteful number, since it uses less digits than its factorization.

25604040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 25604040 is about 5060.0434780741. The cubic root of 25604040 is about 294.7380227083.

Adding to 25604040 its reverse (4040652), we get a palindrome (29644692).

The spelling of 25604040 in words is "twenty-five million, six hundred four thousand, forty".