864628722939 has 4 divisors (see below), whose sum is σ = 1152838297256. Its totient is φ = 576419148624.

The previous prime is 864628722911. The next prime is 864628722943. The reversal of 864628722939 is 939227826468.

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

It is a de Polignac number, because none of the positive numbers 2^k-864628722939 is a prime.

It is a super-2 number, since 2×864628722939² (a number of 25 digits) contains 22 as substring.

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 864628722939.

It is not an unprimeable number, because it can be changed into a prime (864628722949) 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, 144104787154 + ... + 144104787159.

It is an arithmetic number, because the mean of its divisors is an integer number (288209574314).

Almost surely, 2^864628722939 is an apocalyptic number.

864628722939 is a deficient number, since it is larger than the sum of its proper divisors (288209574317).

864628722939 is a wasteful number, since it uses less digits than its factorization.

864628722939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288209574316.

The product of its digits is 125411328, while the sum is 66.

The spelling of 864628722939 in words is "eight hundred sixty-four billion, six hundred twenty-eight million, seven hundred twenty-two thousand, nine hundred thirty-nine".