8427399687 has 24 divisors (see below), whose sum is σ = 13920850944. Its totient is φ = 4812557904.

The previous prime is 8427399671. The next prime is 8427399703. The reversal of 8427399687 is 7869937248.

It is an interprime number because it is at equal distance from previous prime (8427399671) and next prime (8427399703).

It is not a de Polignac number, because 8427399687 - 2⁴ = 8427399671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8427399187) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57478 + ... + 141980.

It is an arithmetic number, because the mean of its divisors is an integer number (580035456).

Almost surely, 2^8427399687 is an apocalyptic number.

8427399687 is a deficient number, since it is larger than the sum of its proper divisors (5493451257).

8427399687 is a wasteful number, since it uses less digits than its factorization.

8427399687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86099 (or 86096 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The square root of 8427399687 is about 91800.8697507818. The cubic root of 8427399687 is about 2035.0005483078. Note that the first 3 decimals are identical.

The spelling of 8427399687 in words is "eight billion, four hundred twenty-seven million, three hundred ninety-nine thousand, six hundred eighty-seven".