9889706257 has 4 divisors (see below), whose sum is σ = 9890242596. Its totient is φ = 9889169920.

The previous prime is 9889706219. The next prime is 9889706263. The reversal of 9889706257 is 7526079889.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9483643456 + 406062801 = 97384^2 + 20151^2 .

It is a cyclic number.

It is not a de Polignac number, because 9889706257 - 2²⁷ = 9755488529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9889706195 and 9889706204.

It is not an unprimeable number, because it can be changed into a prime (9889706287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239488 + ... + 277729.

It is an arithmetic number, because the mean of its divisors is an integer number (2472560649).

Almost surely, 2^9889706257 is an apocalyptic number.

It is an amenable number.

9889706257 is a deficient number, since it is larger than the sum of its proper divisors (536339).

9889706257 is a wasteful number, since it uses less digits than its factorization.

9889706257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536338.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The square root of 9889706257 is about 99447.0022524561. The cubic root of 9889706257 is about 2146.4847013301.

The spelling of 9889706257 in words is "nine billion, eight hundred eighty-nine million, seven hundred six thousand, two hundred fifty-seven".