25280816 has 30 divisors (see below), whose sum is σ = 53575812. Its totient is φ = 11460960.

The previous prime is 25280809. The next prime is 25280839. The reversal of 25280816 is 61808252.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66515 + ... + 66893.

Almost surely, 2^25280816 is an apocalyptic number.

It is an amenable number.

25280816 is an abundant number, since it is smaller than the sum of its proper divisors (28294996).

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

25280816 is an equidigital number, since it uses as much as digits as its factorization.

25280816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 25280816 is about 5028.0031821788. The cubic root of 25280816 is about 293.4925146126.

Subtracting from 25280816 its sum of digits (32), we obtain a square (25280784 = 5028²).

The spelling of 25280816 in words is "twenty-five million, two hundred eighty thousand, eight hundred sixteen".