28556131466 has 4 divisors (see below), whose sum is σ = 42834197202. Its totient is φ = 14278065732.

The previous prime is 28556131447. The next prime is 28556131489. The reversal of 28556131466 is 66413165582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 24450013225 + 4106118241 = 156365^2 + 64079^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28556131466.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7139032865 + ... + 7139032868.

Almost surely, 2^28556131466 is an apocalyptic number.

28556131466 is a deficient number, since it is larger than the sum of its proper divisors (14278065736).

28556131466 is a wasteful number, since it uses less digits than its factorization.

28556131466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14278065735.

The product of its digits is 1036800, while the sum is 47.

The spelling of 28556131466 in words is "twenty-eight billion, five hundred fifty-six million, one hundred thirty-one thousand, four hundred sixty-six".