99860857 has 4 divisors (see below), whose sum is σ = 99938916. Its totient is φ = 99782800.

The previous prime is 99860801. The next prime is 99860879. The reversal of 99860857 is 75806899.

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 37197801 + 62663056 = 6099^2 + 7916^2 .

It is a cyclic number.

It is not a de Polignac number, because 99860857 - 2¹⁵ = 99828089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99860897) 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, 37078 + ... + 39679.

It is an arithmetic number, because the mean of its divisors is an integer number (24984729).

Almost surely, 2^99860857 is an apocalyptic number.

It is an amenable number.

99860857 is a deficient number, since it is larger than the sum of its proper divisors (78059).

99860857 is a wasteful number, since it uses less digits than its factorization.

99860857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78058.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The square root of 99860857 is about 9993.0404282180. The cubic root of 99860857 is about 463.9435019026.

The spelling of 99860857 in words is "ninety-nine million, eight hundred sixty thousand, eight hundred fifty-seven".