25631320 has 64 divisors (see below), whose sum is σ = 67767840. Its totient is φ = 8601600.

The previous prime is 25631317. The next prime is 25631321. The reversal of 25631320 is 2313652.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 25631291 and 25631300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25631321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3480 + ... + 7960.

Almost surely, 2^25631320 is an apocalyptic number.

25631320 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 25631320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33883920).

25631320 is an abundant number, since it is smaller than the sum of its proper divisors (42136520).

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

25631320 is a wasteful number, since it uses less digits than its factorization.

25631320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4516 (or 4512 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 25631320 is about 5062.7383894489. The cubic root of 25631320 is about 294.8426624366.

Adding to 25631320 its reverse (2313652), we get a palindrome (27944972).

It can be divided in two parts, 2563 and 1320, that added together give a palindrome (3883).

The spelling of 25631320 in words is "twenty-five million, six hundred thirty-one thousand, three hundred twenty".