25529520 has 40 divisors (see below), whose sum is σ = 79142256. Its totient is φ = 6807808.

The previous prime is 25529503. The next prime is 25529531. The reversal of 25529520 is 2592552.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 52947 + ... + 53426.

Almost surely, 2^25529520 is an apocalyptic number.

25529520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25529520 is an abundant number, since it is smaller than the sum of its proper divisors (53612736).

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

25529520 is a wasteful number, since it uses less digits than its factorization.

25529520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106389 (or 106383 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 25529520 is about 5052.6745392910. The cubic root of 25529520 is about 294.4518019864.

The spelling of 25529520 in words is "twenty-five million, five hundred twenty-nine thousand, five hundred twenty".