28666502543 has 8 divisors (see below), whose sum is σ = 33647169312. Its totient is φ = 23907198816.

The previous prime is 28666502539. The next prime is 28666502609. The reversal of 28666502543 is 34520566682.

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

It is a cyclic number.

It is not a de Polignac number, because 28666502543 - 2² = 28666502539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28666502503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55340480 + ... + 55340997.

It is an arithmetic number, because the mean of its divisors is an integer number (4205896164).

Almost surely, 2^28666502543 is an apocalyptic number.

28666502543 is a deficient number, since it is larger than the sum of its proper divisors (4980666769).

28666502543 is a wasteful number, since it uses less digits than its factorization.

28666502543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110681521.

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 28666502543 in words is "twenty-eight billion, six hundred sixty-six million, five hundred two thousand, five hundred forty-three".