25321520 has 80 divisors (see below), whose sum is σ = 68090880. Its totient is φ = 8577792.

The previous prime is 25321501. The next prime is 25321529. The reversal of 25321520 is 2512352.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-4 number, since 4×25321520⁴ (a number of 31 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 25321492 and 25321501.

It is not an unprimeable number, because it can be changed into a prime (25321529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57461 + ... + 57899.

It is an arithmetic number, because the mean of its divisors is an integer number (851136).

Almost surely, 2^25321520 is an apocalyptic number.

25321520 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 25321520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34045440).

25321520 is an abundant number, since it is smaller than the sum of its proper divisors (42769360).

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

25321520 is a wasteful number, since it uses less digits than its factorization.

25321520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 25321520 is about 5032.0492843373. The cubic root of 25321520 is about 293.6499451000.

Adding to 25321520 its reverse (2512352), we get a palindrome (27833872).

The spelling of 25321520 in words is "twenty-five million, three hundred twenty-one thousand, five hundred twenty".