8218220456 has 8 divisors (see below), whose sum is σ = 15409163370. Its totient is φ = 4109110224.

The previous prime is 8218220411. The next prime is 8218220503. The reversal of 8218220456 is 6540228128.

It can be written as a sum of positive squares in only one way, i.e., 4377939556 + 3840280900 = 66166^2 + 61970^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 513638771 + ... + 513638786.

Almost surely, 2^8218220456 is an apocalyptic number.

It is an amenable number.

8218220456 is a deficient number, since it is larger than the sum of its proper divisors (7190942914).

8218220456 is a wasteful number, since it uses less digits than its factorization.

8218220456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027277563 (or 1027277559 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 8218220456 is about 90654.4011948675. The cubic root of 8218220456 is about 2018.0221512360.

The spelling of 8218220456 in words is "eight billion, two hundred eighteen million, two hundred twenty thousand, four hundred fifty-six".