28906436786 has 4 divisors (see below), whose sum is σ = 43359655182. Its totient is φ = 14453218392.

The previous prime is 28906436773. The next prime is 28906436843. The reversal of 28906436786 is 68763460982.

28906436786 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68763460982 = 2 ⋅34381730491.

It can be written as a sum of positive squares in only one way, i.e., 17695650625 + 11210786161 = 133025^2 + 105881^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7226609195 + ... + 7226609198.

Almost surely, 2^28906436786 is an apocalyptic number.

28906436786 is a deficient number, since it is larger than the sum of its proper divisors (14453218396).

28906436786 is a wasteful number, since it uses less digits than its factorization.

28906436786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14453218395.

The product of its (nonzero) digits is 20901888, while the sum is 59.

The spelling of 28906436786 in words is "twenty-eight billion, nine hundred six million, four hundred thirty-six thousand, seven hundred eighty-six".