25800140 has 24 divisors (see below), whose sum is σ = 56049840. Its totient is φ = 9963968.

The previous prime is 25800127. The next prime is 25800149. The reversal of 25800140 is 4100852.

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 (25800149) 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, 21662 + ... + 22821.

It is an arithmetic number, because the mean of its divisors is an integer number (2335410).

Almost surely, 2^25800140 is an apocalyptic number.

25800140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25800140 is an abundant number, since it is smaller than the sum of its proper divisors (30249700).

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

25800140 is a wasteful number, since it uses less digits than its factorization.

25800140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44521 (or 44519 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 25800140 is about 5079.3838208980. The cubic root of 25800140 is about 295.4885708420.

Adding to 25800140 its reverse (4100852), we get a palindrome (29900992).

The spelling of 25800140 in words is "twenty-five million, eight hundred thousand, one hundred forty".