25601320 has 32 divisors (see below), whose sum is σ = 60993000. Its totient is φ = 9637888.

The previous prime is 25601291. The next prime is 25601321. The reversal of 25601320 is 2310652.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25583364 + 17956 = 5058^2 + 134^2 .

It is a super-4 number, since 4×25601320⁴ (a number of 31 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (25601321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18145 + ... + 19504.

Almost surely, 2^25601320 is an apocalyptic number.

25601320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25601320 is an abundant number, since it is smaller than the sum of its proper divisors (35391680).

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

25601320 is a wasteful number, since it uses less digits than its factorization.

25601320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37677 (or 37673 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 25601320 is about 5059.7746985414. The cubic root of 25601320 is about 294.7275853475.

Adding to 25601320 its reverse (2310652), we get a palindrome (27911972).

It can be divided in two parts, 25601 and 320, that added together give a square (25921 = 161²).

The spelling of 25601320 in words is "twenty-five million, six hundred one thousand, three hundred twenty".