25531520 has 128 divisors (see below), whose sum is σ = 71971200. Its totient is φ = 8478720.

The previous prime is 25531453. The next prime is 25531523. The reversal of 25531520 is 2513552.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (25531523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183611 + ... + 183749.

It is an arithmetic number, because the mean of its divisors is an integer number (562275).

Almost surely, 2^25531520 is an apocalyptic number.

25531520 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 25531520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35985600).

25531520 is an abundant number, since it is smaller than the sum of its proper divisors (46439680).

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

25531520 is a wasteful number, since it uses less digits than its factorization.

25531520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 25531520 is about 5052.8724503989. The cubic root of 25531520 is about 294.4594909706.

The spelling of 25531520 in words is "twenty-five million, five hundred thirty-one thousand, five hundred twenty".