25285780 has 36 divisors (see below), whose sum is σ = 57506652. Its totient is φ = 9335040.

The previous prime is 25285759. The next prime is 25285829. The reversal of 25285780 is 8758252.

It can be written as a sum of positive squares in 6 ways, for example, as 1607824 + 23677956 = 1268^2 + 4866^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 361 + ... + 7120.

It is an arithmetic number, because the mean of its divisors is an integer number (1597407).

Almost surely, 2^25285780 is an apocalyptic number.

25285780 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 25285780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28753326).

25285780 is an abundant number, since it is smaller than the sum of its proper divisors (32220872).

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

25285780 is a wasteful number, since it uses less digits than its factorization.

25285780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7516 (or 7501 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 25285780 is about 5028.4967932773. The cubic root of 25285780 is about 293.5117228731.

The spelling of 25285780 in words is "twenty-five million, two hundred eighty-five thousand, seven hundred eighty".