25320645 has 48 divisors (see below), whose sum is σ = 51796992. Its totient is φ = 11197440.

The previous prime is 25320643. The next prime is 25320649. The reversal of 25320645 is 54602352.

It is not a de Polignac number, because 25320645 - 2¹ = 25320643 is a prime.

It is a super-2 number, since 2×25320645² = 1282270126432050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25320641) 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 47 ways as a sum of consecutive naturals, for example, 8469 + ... + 11061.

It is an arithmetic number, because the mean of its divisors is an integer number (1079104).

Almost surely, 2^25320645 is an apocalyptic number.

It is an amenable number.

25320645 is an abundant number, since it is smaller than the sum of its proper divisors (26476347).

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

25320645 is a wasteful number, since it uses less digits than its factorization.

25320645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642 (or 2639 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 25320645 is about 5031.9623408766. The cubic root of 25320645 is about 293.6465626456.

Adding to 25320645 its reverse (54602352), we get a palindrome (79922997).

The spelling of 25320645 in words is "twenty-five million, three hundred twenty thousand, six hundred forty-five".