872221865 has 8 divisors (see below), whose sum is σ = 1061408448. Its totient is φ = 687949360.

The previous prime is 872221829. The next prime is 872221877. The reversal of 872221865 is 568122278.

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-872221865 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1228127 + ... + 1228836.

It is an arithmetic number, because the mean of its divisors is an integer number (132676056).

Almost surely, 2^872221865 is an apocalyptic number.

It is an amenable number.

872221865 is a deficient number, since it is larger than the sum of its proper divisors (189186583).

872221865 is a wasteful number, since it uses less digits than its factorization.

872221865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457039.

The product of its digits is 107520, while the sum is 41.

The square root of 872221865 is about 29533.4025300168. The cubic root of 872221865 is about 955.4522551157.

The spelling of 872221865 in words is "eight hundred seventy-two million, two hundred twenty-one thousand, eight hundred sixty-five".