25385520 has 120 divisors (see below), whose sum is σ = 83338416. Its totient is φ = 6391296.

The previous prime is 25385513. The next prime is 25385533. The reversal of 25385520 is 2558352.

It is a tau number, because it is divible by the number of its divisors (120).

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 23 ways as a sum of consecutive naturals, for example, 86494 + ... + 86786.

Almost surely, 2^25385520 is an apocalyptic number.

25385520 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 25385520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41669208).

25385520 is an abundant number, since it is smaller than the sum of its proper divisors (57952896).

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

25385520 is a wasteful number, since it uses less digits than its factorization.

25385520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 25385520 is about 5038.4045093660. The cubic root of 25385520 is about 293.8971364892.

The spelling of 25385520 in words is "twenty-five million, three hundred eighty-five thousand, five hundred twenty".