28661628863 has 8 divisors (see below), whose sum is σ = 33812797440. Its totient is φ = 23774622840.

The previous prime is 28661628847. The next prime is 28661628881. The reversal of 28661628863 is 36882616682.

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 28661628863 - 2⁴ = 28661628847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28661628799 and 28661628808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28661628563) 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, 66040403 + ... + 66040836.

It is an arithmetic number, because the mean of its divisors is an integer number (4226599680).

Almost surely, 2^28661628863 is an apocalyptic number.

28661628863 is a deficient number, since it is larger than the sum of its proper divisors (5151168577).

28661628863 is a wasteful number, since it uses less digits than its factorization.

28661628863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132081277.

The product of its digits is 7962624, while the sum is 56.

The spelling of 28661628863 in words is "twenty-eight billion, six hundred sixty-one million, six hundred twenty-eight thousand, eight hundred sixty-three".