25986280 has 16 divisors (see below), whose sum is σ = 58469220. Its totient is φ = 10394496.

The previous prime is 25986263. The next prime is 25986287. The reversal of 25986280 is 8268952.

It can be written as a sum of positive squares in 2 ways, for example, as 22867524 + 3118756 = 4782^2 + 1766^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 649657 = 25986280 / (2 + 5 + 9 + 8 + 6 + 2 + 8 + 0).

It is not an unprimeable number, because it can be changed into a prime (25986287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324789 + ... + 324868.

Almost surely, 2^25986280 is an apocalyptic number.

25986280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25986280 is an abundant number, since it is smaller than the sum of its proper divisors (32482940).

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

25986280 is a wasteful number, since it uses less digits than its factorization.

25986280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649668 (or 649664 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 25986280 is about 5097.6739793753. The cubic root of 25986280 is about 296.1974881259.

The spelling of 25986280 in words is "twenty-five million, nine hundred eighty-six thousand, two hundred eighty".