25509880 has 32 divisors (see below), whose sum is σ = 62616240. Its totient is φ = 9276160.

The previous prime is 25509871. The next prime is 25509881. The reversal of 25509880 is 8890552.

It is a happy number.

It is a super-2 number, since 2×25509880² = 1301507955228800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25509881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28549 + ... + 29428.

Almost surely, 2^25509880 is an apocalyptic number.

25509880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25509880 is an abundant number, since it is smaller than the sum of its proper divisors (37106360).

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

25509880 is a wasteful number, since it uses less digits than its factorization.

25509880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57999 (or 57995 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 25509880 is about 5050.7306402143. The cubic root of 25509880 is about 294.3762748189.

It can be divided in two parts, 25 and 509880, that added together give a palindrome (509905).

The spelling of 25509880 in words is "twenty-five million, five hundred nine thousand, eight hundred eighty".