8220404865 has 8 divisors (see below), whose sum is σ = 13152647808. Its totient is φ = 4384215920.

The previous prime is 8220404851. The next prime is 8220404897. The reversal of 8220404865 is 5684040228.

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

It is not a de Polignac number, because 8220404865 - 2⁸ = 8220404609 is a prime.

It is a super-2 number, since 2×8220404865² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274013481 + ... + 274013510.

It is an arithmetic number, because the mean of its divisors is an integer number (1644080976).

Almost surely, 2^8220404865 is an apocalyptic number.

It is an amenable number.

8220404865 is a deficient number, since it is larger than the sum of its proper divisors (4932242943).

8220404865 is a wasteful number, since it uses less digits than its factorization.

8220404865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548026999.

The product of its (nonzero) digits is 122880, while the sum is 39.

The square root of 8220404865 is about 90666.4483974088. The cubic root of 8220404865 is about 2018.2009326508.

The spelling of 8220404865 in words is "eight billion, two hundred twenty million, four hundred four thousand, eight hundred sixty-five".