25780736 has 40 divisors (see below), whose sum is σ = 52754064. Its totient is φ = 12579840.

The previous prime is 25780709. The next prime is 25780763. The reversal of 25780736 is 63708752.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25780709) and next prime (25780763).

It is a self number, because there is not a number n which added to its sum of digits gives 25780736.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21431 + ... + 22601.

Almost surely, 2^25780736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25780736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26377032).

25780736 is an abundant number, since it is smaller than the sum of its proper divisors (26973328).

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

25780736 is an equidigital number, since it uses as much as digits as its factorization.

25780736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232 (or 1216 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 25780736 is about 5077.4733874241. The cubic root of 25780736 is about 295.4144743676.

The spelling of 25780736 in words is "twenty-five million, seven hundred eighty thousand, seven hundred thirty-six".