8420086687 has 4 divisors (see below), whose sum is σ = 8435043000. Its totient is φ = 8405130376.

The previous prime is 8420086643. The next prime is 8420086699. The reversal of 8420086687 is 7866800248.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8420086687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8420086687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420086637) 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, 7477312 + ... + 7478437.

It is an arithmetic number, because the mean of its divisors is an integer number (2108760750).

Almost surely, 2^8420086687 is an apocalyptic number.

8420086687 is a deficient number, since it is larger than the sum of its proper divisors (14956313).

8420086687 is a wasteful number, since it uses less digits than its factorization.

8420086687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14956312.

The product of its (nonzero) digits is 1032192, while the sum is 49.

The square root of 8420086687 is about 91761.0303287839. The cubic root of 8420086687 is about 2034.4117440772.

The spelling of 8420086687 in words is "eight billion, four hundred twenty million, eighty-six thousand, six hundred eighty-seven".