8265687891 has 16 divisors (see below), whose sum is σ = 11230053120. Its totient is φ = 5406873120.

The previous prime is 8265687889. The next prime is 8265687901. The reversal of 8265687891 is 1987865628.

It is not a de Polignac number, because 8265687891 - 2¹ = 8265687889 is a prime.

It is a super-2 number, since 2×8265687891² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8265687811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89025 + ... + 156386.

It is an arithmetic number, because the mean of its divisors is an integer number (701878320).

Almost surely, 2^8265687891 is an apocalyptic number.

8265687891 is a deficient number, since it is larger than the sum of its proper divisors (2964365229).

8265687891 is a wasteful number, since it uses less digits than its factorization.

8265687891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245626.

The product of its digits is 11612160, while the sum is 60.

The square root of 8265687891 is about 90915.8286053644. The cubic root of 8265687891 is about 2021.8999777843.

The spelling of 8265687891 in words is "eight billion, two hundred sixty-five million, six hundred eighty-seven thousand, eight hundred ninety-one".