9687857257 has 4 divisors (see below), whose sum is σ = 10433077060. Its totient is φ = 8942637456.

The previous prime is 9687857239. The next prime is 9687857273. The reversal of 9687857257 is 7527587869.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7527587869 = 43 ⋅175060183.

It can be written as a sum of positive squares in 2 ways, for example, as 4796393536 + 4891463721 = 69256^2 + 69939^2 .

It is a cyclic number.

It is not a de Polignac number, because 9687857257 - 2³¹ = 7540373609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9687857357) 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, 372609882 + ... + 372609907.

It is an arithmetic number, because the mean of its divisors is an integer number (2608269265).

Almost surely, 2^9687857257 is an apocalyptic number.

It is an amenable number.

9687857257 is a deficient number, since it is larger than the sum of its proper divisors (745219803).

9687857257 is a wasteful number, since it uses less digits than its factorization.

9687857257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745219802.

The product of its digits is 59270400, while the sum is 64.

The square root of 9687857257 is about 98426.9132757906. The cubic root of 9687857257 is about 2131.7809505496.

The spelling of 9687857257 in words is "nine billion, six hundred eighty-seven million, eight hundred fifty-seven thousand, two hundred fifty-seven".