25780140 has 48 divisors (see below), whose sum is σ = 80206560. Its totient is φ = 6874560.

The previous prime is 25780121. The next prime is 25780141. The reversal of 25780140 is 4108752.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (25780141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23331 + ... + 24410.

It is an arithmetic number, because the mean of its divisors is an integer number (1670970).

Almost surely, 2^25780140 is an apocalyptic number.

25780140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25780140 is an abundant number, since it is smaller than the sum of its proper divisors (54426420).

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

25780140 is a wasteful number, since it uses less digits than its factorization.

25780140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47759 (or 47751 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 25780140 is about 5077.4146964769. The cubic root of 25780140 is about 295.4121978825.

Adding to 25780140 its reverse (4108752), we get a palindrome (29888892).

The spelling of 25780140 in words is "twenty-five million, seven hundred eighty thousand, one hundred forty".