25504040 has 16 divisors (see below), whose sum is σ = 57384180. Its totient is φ = 10201600.

The previous prime is 25504027. The next prime is 25504043. The reversal of 25504040 is 4040552.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24068836 + 1435204 = 4906^2 + 1198^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (25504043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318761 + ... + 318840.

Almost surely, 2^25504040 is an apocalyptic number.

25504040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25504040 is an abundant number, since it is smaller than the sum of its proper divisors (31880140).

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

25504040 is a wasteful number, since it uses less digits than its factorization.

25504040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637612 (or 637608 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 25504040 is about 5050.1524729457. The cubic root of 25504040 is about 294.3538091618.

Adding to 25504040 its reverse (4040552), we get a palindrome (29544592).

The spelling of 25504040 in words is "twenty-five million, five hundred four thousand, forty".