25320540 has 144 divisors (see below), whose sum is σ = 86026752. Its totient is φ = 5450112.

The previous prime is 25320481. The next prime is 25320553. The reversal of 25320540 is 4502352.

It is a super-2 number, since 2×25320540² = 1282259491783200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 151537 + ... + 151703.

It is an arithmetic number, because the mean of its divisors is an integer number (597408).

Almost surely, 2^25320540 is an apocalyptic number.

25320540 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 25320540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43013376).

25320540 is an abundant number, since it is smaller than the sum of its proper divisors (60706212).

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

25320540 is a wasteful number, since it uses less digits than its factorization.

25320540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 25320540 is about 5031.9519075603. The cubic root of 25320540 is about 293.6461567458.

Adding to 25320540 its reverse (4502352), we get a palindrome (29822892).

The spelling of 25320540 in words is "twenty-five million, three hundred twenty thousand, five hundred forty".