28668781535 has 4 divisors (see below), whose sum is σ = 34402537848. Its totient is φ = 22935025224.

The previous prime is 28668781513. The next prime is 28668781597. The reversal of 28668781535 is 53518786682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53518786682 = 2 ⋅26759393341.

It is a cyclic number.

It is not a de Polignac number, because 28668781535 - 2⁸ = 28668781279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2866878149 + ... + 2866878158.

It is an arithmetic number, because the mean of its divisors is an integer number (8600634462).

Almost surely, 2^28668781535 is an apocalyptic number.

28668781535 is a deficient number, since it is larger than the sum of its proper divisors (5733756313).

28668781535 is an equidigital number, since it uses as much as digits as its factorization.

28668781535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5733756312.

The product of its digits is 19353600, while the sum is 59.

The spelling of 28668781535 in words is "twenty-eight billion, six hundred sixty-eight million, seven hundred eighty-one thousand, five hundred thirty-five".