28046864666 has 4 divisors (see below), whose sum is σ = 42070297002. Its totient is φ = 14023432332.

The previous prime is 28046864623. The next prime is 28046864689. The reversal of 28046864666 is 66646864082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66646864082 = 2 ⋅33323432041.

It can be written as a sum of positive squares in only one way, i.e., 27078348025 + 968516641 = 164555^2 + 31121^2 .

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, 7011716165 + ... + 7011716168.

Almost surely, 2^28046864666 is an apocalyptic number.

28046864666 is a deficient number, since it is larger than the sum of its proper divisors (14023432336).

28046864666 is a wasteful number, since it uses less digits than its factorization.

28046864666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14023432335.

The product of its (nonzero) digits is 15925248, while the sum is 56.

The spelling of 28046864666 in words is "twenty-eight billion, forty-six million, eight hundred sixty-four thousand, six hundred sixty-six".