864563869 has 4 divisors (see below), whose sum is σ = 931068796. Its totient is φ = 798058944.

The previous prime is 864563851. The next prime is 864563873. The reversal of 864563869 is 968365468.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 70056900 + 794506969 = 8370^2 + 28187^2 .

It is a cyclic number.

It is not a de Polignac number, because 864563869 - 2⁵ = 864563837 is a prime.

It is a super-2 number, since 2×864563869² = 1494941367160498322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864563839) 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, 33252444 + ... + 33252469.

It is an arithmetic number, because the mean of its divisors is an integer number (232767199).

Almost surely, 2^864563869 is an apocalyptic number.

It is an amenable number.

864563869 is a deficient number, since it is larger than the sum of its proper divisors (66504927).

864563869 is a wasteful number, since it uses less digits than its factorization.

864563869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66504926.

The product of its digits is 7464960, while the sum is 55.

The square root of 864563869 is about 29403.4669554459. The cubic root of 864563869 is about 952.6477820132.

The spelling of 864563869 in words is "eight hundred sixty-four million, five hundred sixty-three thousand, eight hundred sixty-nine".