25509072 has 40 divisors (see below), whose sum is σ = 66495744. Its totient is φ = 8425984.

The previous prime is 25509053. The next prime is 25509089. The reversal of 25509072 is 27090552.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3073 + ... + 7775.

Almost surely, 2^25509072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25509072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33247872).

25509072 is an abundant number, since it is smaller than the sum of its proper divisors (40986672).

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

25509072 is a wasteful number, since it uses less digits than its factorization.

25509072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4827 (or 4821 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 25509072 is about 5050.6506511538. The cubic root of 25509072 is about 294.3731667612.

The spelling of 25509072 in words is "twenty-five million, five hundred nine thousand, seventy-two".