25509432 has 32 divisors (see below), whose sum is σ = 68680080. Its totient is φ = 7848960.

The previous prime is 25509431. The next prime is 25509433. The reversal of 25509432 is 23490552.

It is an interprime number because it is at equal distance from previous prime (25509431) and next prime (25509433).

It is a super-2 number, since 2×25509432² = 1301462241925248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25509432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25509431) 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, 40569 + ... + 41192.

Almost surely, 2^25509432 is an apocalyptic number.

It is an amenable number.

25509432 is an abundant number, since it is smaller than the sum of its proper divisors (43170648).

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

25509432 is a wasteful number, since it uses less digits than its factorization.

25509432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81783 (or 81779 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 25509432 is about 5050.6862900006. The cubic root of 25509432 is about 294.3745515475.

Adding to 25509432 its reverse (23490552), we get a palindrome (48999984).

The spelling of 25509432 in words is "twenty-five million, five hundred nine thousand, four hundred thirty-two".