25231645 has 8 divisors (see below), whose sum is σ = 30791520. Its totient is φ = 19842960.

The previous prime is 25231643. The next prime is 25231649. The reversal of 25231645 is 54613252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25231645 - 2¹ = 25231643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25231643) 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, 42471 + ... + 43060.

It is an arithmetic number, because the mean of its divisors is an integer number (3848940).

Almost surely, 2^25231645 is an apocalyptic number.

It is an amenable number.

25231645 is a deficient number, since it is larger than the sum of its proper divisors (5559875).

25231645 is an equidigital number, since it uses as much as digits as its factorization.

25231645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85595.

The product of its digits is 7200, while the sum is 28.

The square root of 25231645 is about 5023.1110877622. Note that the first 3 decimals coincide. The cubic root of 25231645 is about 293.3021108584.

Adding to 25231645 its reverse (54613252), we get a palindrome (79844897).

The spelling of 25231645 in words is "twenty-five million, two hundred thirty-one thousand, six hundred forty-five".