28321218466 has 8 divisors (see below), whose sum is σ = 43517969964. Its totient is φ = 13815228480.

The previous prime is 28321218439. The next prime is 28321218467. The reversal of 28321218466 is 66481212382.

It is a happy number.

28321218466 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 22856904225 + 5464314241 = 151185^2 + 73921^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28321218467) 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, 172690275 + ... + 172690438.

Almost surely, 2^28321218466 is an apocalyptic number.

28321218466 is a deficient number, since it is larger than the sum of its proper divisors (15196751498).

28321218466 is a wasteful number, since it uses less digits than its factorization.

28321218466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345380756.

The product of its digits is 221184, while the sum is 43.

The spelling of 28321218466 in words is "twenty-eight billion, three hundred twenty-one million, two hundred eighteen thousand, four hundred sixty-six".