864572811 has 8 divisors (see below), whose sum is σ = 1153098960. Its totient is φ = 576214272.

The previous prime is 864572773. The next prime is 864572851. The reversal of 864572811 is 118275468.

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

It is a de Polignac number, because none of the positive numbers 2^k-864572811 is a prime.

It is a super-2 number, since 2×864572811² = 1494972291040883442, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (864572851) 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, 29326 + ... + 50883.

It is an arithmetic number, because the mean of its divisors is an integer number (144137370).

Almost surely, 2^864572811 is an apocalyptic number.

864572811 is a deficient number, since it is larger than the sum of its proper divisors (288526149).

864572811 is a wasteful number, since it uses less digits than its factorization.

864572811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83805.

The product of its digits is 107520, while the sum is 42.

The square root of 864572811 is about 29403.6190119516. The cubic root of 864572811 is about 952.6510663463.

The spelling of 864572811 in words is "eight hundred sixty-four million, five hundred seventy-two thousand, eight hundred eleven".