28666337678 has 8 divisors (see below), whose sum is σ = 46908552600. Its totient is φ = 13030153480.

The previous prime is 28666337677. The next prime is 28666337683. The reversal of 28666337678 is 87673366682.

It is a happy number.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28666337678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28666337677) 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, 651507653 + ... + 651507696.

It is an arithmetic number, because the mean of its divisors is an integer number (5863569075).

Almost surely, 2^28666337678 is an apocalyptic number.

28666337678 is a deficient number, since it is larger than the sum of its proper divisors (18242214922).

28666337678 is a wasteful number, since it uses less digits than its factorization.

28666337678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303015362.

The product of its digits is 73156608, while the sum is 62.

The spelling of 28666337678 in words is "twenty-eight billion, six hundred sixty-six million, three hundred thirty-seven thousand, six hundred seventy-eight".