102887905 has 4 divisors (see below), whose sum is σ = 123465492. Its totient is φ = 82310320.

The previous prime is 102887891. The next prime is 102887933. The reversal of 102887905 is 509788201.

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 42732369 + 60155536 = 6537^2 + 7756^2 .

It is not a de Polignac number, because 102887905 - 2¹¹ = 102885857 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

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, 10288786 + ... + 10288795.

It is an arithmetic number, because the mean of its divisors is an integer number (30866373).

Almost surely, 2^102887905 is an apocalyptic number.

It is an amenable number.

102887905 is a deficient number, since it is larger than the sum of its proper divisors (20577587).

102887905 is an equidigital number, since it uses as much as digits as its factorization.

102887905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20577586.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 102887905 is about 10143.3675374601. The cubic root of 102887905 is about 468.5847042666.

The spelling of 102887905 in words is "one hundred two million, eight hundred eighty-seven thousand, nine hundred five".