102800857 has 4 divisors (see below), whose sum is σ = 102833316. Its totient is φ = 102768400.

The previous prime is 102800807. The next prime is 102800879. The reversal of 102800857 is 758008201.

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 68823616 + 33977241 = 8296^2 + 5829^2 .

It is a cyclic number.

It is not a de Polignac number, because 102800857 - 2¹¹ = 102798809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102800807) 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 3 ways as a sum of consecutive naturals, for example, 10894 + ... + 18007.

It is an arithmetic number, because the mean of its divisors is an integer number (25708329).

Almost surely, 2^102800857 is an apocalyptic number.

It is an amenable number.

102800857 is a deficient number, since it is larger than the sum of its proper divisors (32459).

102800857 is an equidigital number, since it uses as much as digits as its factorization.

102800857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32458.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 102800857 is about 10139.0757468322. The cubic root of 102800857 is about 468.4525187586.

The spelling of 102800857 in words is "one hundred two million, eight hundred thousand, eight hundred fifty-seven".