25391648 has 12 divisors (see below), whose sum is σ = 49989870. Its totient is φ = 12695808.

The previous prime is 25391647. The next prime is 25391689. The reversal of 25391648 is 84619352.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 22391824 + 2999824 = 4732^2 + 1732^2 .

It is not an unprimeable number, because it can be changed into a prime (25391647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 396713 + ... + 396776.

Almost surely, 2^25391648 is an apocalyptic number.

It is an amenable number.

25391648 is a deficient number, since it is larger than the sum of its proper divisors (24598222).

25391648 is an equidigital number, since it uses as much as digits as its factorization.

25391648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793499 (or 793491 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 25391648 is about 5039.0126016909. The cubic root of 25391648 is about 293.9207832604.

The spelling of 25391648 in words is "twenty-five million, three hundred ninety-one thousand, six hundred forty-eight".