25506040 has 64 divisors (see below), whose sum is σ = 66562560. Its totient is φ = 8615040.

The previous prime is 25505989. The next prime is 25506049. The reversal of 25506040 is 4060552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25506049) 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, 19239 + ... + 20521.

It is an arithmetic number, because the mean of its divisors is an integer number (1040040).

Almost surely, 2^25506040 is an apocalyptic number.

25506040 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 25506040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33281280).

25506040 is an abundant number, since it is smaller than the sum of its proper divisors (41056520).

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

25506040 is a wasteful number, since it uses less digits than its factorization.

25506040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372 (or 1368 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 25506040 is about 5050.3504828873. The cubic root of 25506040 is about 294.3615032661.

Adding to 25506040 its reverse (4060552), we get a palindrome (29566592).

The spelling of 25506040 in words is "twenty-five million, five hundred six thousand, forty".