25435520 has 64 divisors (see below), whose sum is σ = 66353040. Its totient is φ = 9246720.

The previous prime is 25435517. The next prime is 25435561. The reversal of 25435520 is 2553452.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 25435520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5234 + ... + 8846.

Almost surely, 2^25435520 is an apocalyptic number.

25435520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25435520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33176520).

25435520 is an abundant number, since it is smaller than the sum of its proper divisors (40917520).

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

25435520 is a wasteful number, since it uses less digits than its factorization.

25435520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3643 (or 3631 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 25435520 is about 5043.3639567257. The cubic root of 25435520 is about 294.0899658340.

Adding to 25435520 its reverse (2553452), we get a palindrome (27988972).

The spelling of 25435520 in words is "twenty-five million, four hundred thirty-five thousand, five hundred twenty".