28910572666 has 8 divisors (see below), whose sum is σ = 43959912084. Its totient is φ = 14257268640.

The previous prime is 28910572583. The next prime is 28910572693. The reversal of 28910572666 is 66627501982.

It can be written as a sum of positive squares in 2 ways, for example, as 27157392025 + 1753180641 = 164795^2 + 41871^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99008665 + ... + 99008956.

Almost surely, 2^28910572666 is an apocalyptic number.

28910572666 is a deficient number, since it is larger than the sum of its proper divisors (15049339418).

28910572666 is a wasteful number, since it uses less digits than its factorization.

28910572666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198017696.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 28910572666 in words is "twenty-eight billion, nine hundred ten million, five hundred seventy-two thousand, six hundred sixty-six".