8205397687 has 4 divisors (see below), whose sum is σ = 8206527640. Its totient is φ = 8204267736.

The previous prime is 8205397639. The next prime is 8205397693. The reversal of 8205397687 is 7867935028.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8205397687 - 2²⁷ = 8071179959 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 (8205997687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554013 + ... + 568630.

It is an arithmetic number, because the mean of its divisors is an integer number (2051631910).

Almost surely, 2^8205397687 is an apocalyptic number.

8205397687 is a deficient number, since it is larger than the sum of its proper divisors (1129953).

8205397687 is a wasteful number, since it uses less digits than its factorization.

8205397687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129952.

The product of its (nonzero) digits is 5080320, while the sum is 55.

The square root of 8205397687 is about 90583.6502190103. The cubic root of 8205397687 is about 2016.9720414217.

The spelling of 8205397687 in words is "eight billion, two hundred five million, three hundred ninety-seven thousand, six hundred eighty-seven".