25781250 has 72 divisors (see below), whose sum is σ = 70312464. Its totient is φ = 6250000.

The previous prime is 25781237. The next prime is 25781257. The reversal of 25781250 is 5218752.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25781257) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2343745 + ... + 2343755.

It is an arithmetic number, because the mean of its divisors is an integer number (976562).

Almost surely, 2^25781250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25781250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35156232).

25781250 is an abundant number, since it is smaller than the sum of its proper divisors (44531214).

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

25781250 is an frugal number, since it uses more digits than its factorization.

25781250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 25781250 is about 5077.5240028975. The cubic root of 25781250 is about 295.4164376169.

It can be divided in two parts, 2578 and 1250, that added together give a triangular number (3828 = T₈₇).

The spelling of 25781250 in words is "twenty-five million, seven hundred eighty-one thousand, two hundred fifty".