25209280 has 28 divisors (see below), whose sum is σ = 60030360. Its totient is φ = 10083584.

The previous prime is 25209277. The next prime is 25209281. The reversal of 25209280 is 8290252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25209281) 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, 39070 + ... + 39709.

Almost surely, 2^25209280 is an apocalyptic number.

25209280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25209280 is an abundant number, since it is smaller than the sum of its proper divisors (34821080).

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

25209280 is an equidigital number, since it uses as much as digits as its factorization.

25209280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78796 (or 78786 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 25209280 is about 5020.8843842495. The cubic root of 25209280 is about 293.2154255232.

The spelling of 25209280 in words is "twenty-five million, two hundred nine thousand, two hundred eighty".