25445340 has 120 divisors (see below), whose sum is σ = 81108720. Its totient is φ = 6676992.

The previous prime is 25445333. The next prime is 25445341. The reversal of 25445340 is 4354452.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25445341) 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 39 ways as a sum of consecutive naturals, for example, 182991 + ... + 183129.

It is an arithmetic number, because the mean of its divisors is an integer number (675906).

Almost surely, 2^25445340 is an apocalyptic number.

25445340 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 25445340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40554360).

25445340 is an abundant number, since it is smaller than the sum of its proper divisors (55663380).

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

25445340 is a wasteful number, since it uses less digits than its factorization.

25445340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 25445340 is about 5044.3374193248. The cubic root of 25445340 is about 294.1278078215.

Adding to 25445340 its reverse (4354452), we get a palindrome (29799792).

The spelling of 25445340 in words is "twenty-five million, four hundred forty-five thousand, three hundred forty".