864872648639 has 8 divisors (see below), whose sum is σ = 865692154800. Its totient is φ = 864053297856.

The previous prime is 864872648621. The next prime is 864872648659. The reversal of 864872648639 is 936846278468.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864872648639 is a prime.

It is a super-3 number, since 3×864872648639³ (a number of 37 digits) contains 333 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 (864872648659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13201187 + ... + 13266539.

It is an arithmetic number, because the mean of its divisors is an integer number (108211519350).

Almost surely, 2^864872648639 is an apocalyptic number.

864872648639 is a deficient number, since it is larger than the sum of its proper divisors (819506161).

864872648639 is a wasteful number, since it uses less digits than its factorization.

864872648639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77689.

The product of its digits is 668860416, while the sum is 71.

The spelling of 864872648639 in words is "eight hundred sixty-four billion, eight hundred seventy-two million, six hundred forty-eight thousand, six hundred thirty-nine".