25628945 has 16 divisors (see below), whose sum is σ = 33184080. Its totient is φ = 18929664.

The previous prime is 25628921. The next prime is 25628947. The reversal of 25628945 is 54982652.

It can be written as a sum of positive squares in 8 ways, for example, as 5414929 + 20214016 = 2327^2 + 4496^2 .

It is a cyclic number.

It is not a de Polignac number, because 25628945 - 2⁸ = 25628689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25628947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1661 + ... + 7349.

It is an arithmetic number, because the mean of its divisors is an integer number (2074005).

Almost surely, 2^25628945 is an apocalyptic number.

It is an amenable number.

25628945 is a deficient number, since it is larger than the sum of its proper divisors (7555135).

25628945 is a wasteful number, since it uses less digits than its factorization.

25628945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5764.

The product of its digits is 172800, while the sum is 41.

The square root of 25628945 is about 5062.5038271590. The cubic root of 25628945 is about 294.8335554410.

The spelling of 25628945 in words is "twenty-five million, six hundred twenty-eight thousand, nine hundred forty-five".