8102787813 has 12 divisors (see below), whose sum is σ = 11741423980. Its totient is φ = 5384598336.

The previous prime is 8102787779. The next prime is 8102787821. The reversal of 8102787813 is 3187872018.

It can be written as a sum of positive squares in 2 ways, for example, as 4098176289 + 4004611524 = 64017^2 + 63282^2 .

It is not a de Polignac number, because 8102787813 - 2¹³ = 8102779621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8102787853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1435378 + ... + 1441011.

Almost surely, 2^8102787813 is an apocalyptic number.

It is an amenable number.

8102787813 is a deficient number, since it is larger than the sum of its proper divisors (3638636167).

8102787813 is a wasteful number, since it uses less digits than its factorization.

8102787813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876708 (or 2876705 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The square root of 8102787813 is about 90015.4865175987. The cubic root of 8102787813 is about 2008.5292255325.

The spelling of 8102787813 in words is "eight billion, one hundred two million, seven hundred eighty-seven thousand, eight hundred thirteen".