7891657225 has 27 divisors (see below), whose sum is σ = 9937217493. Its totient is φ = 6217028640.

The previous prime is 7891657223. The next prime is 7891657237. The reversal of 7891657225 is 5227561987.

It is a happy number.

The square root of 7891657225 is 88835.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 28933641 + 7862723584 = 5379^2 + 88672^2 .

It is not a de Polignac number, because 7891657225 - 2¹ = 7891657223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7891657223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 48414994 + ... + 48415156.

Almost surely, 2^7891657225 is an apocalyptic number.

7891657225 is the 88835-th square number.

7891657225 is the 44418-th centered octagonal number.

It is an amenable number.

7891657225 is a deficient number, since it is larger than the sum of its proper divisors (2045560268).

7891657225 is an equidigital number, since it uses as much as digits as its factorization.

7891657225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 277 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 52.

The cubic root of 7891657225 is about 1990.9303684797.

The spelling of 7891657225 in words is "seven billion, eight hundred ninety-one million, six hundred fifty-seven thousand, two hundred twenty-five".