28686869746 has 4 divisors (see below), whose sum is σ = 43030304622. Its totient is φ = 14343434872.

The previous prime is 28686869741. The next prime is 28686869753. The reversal of 28686869746 is 64796868682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16655193025 + 12031676721 = 129055^2 + 109689^2 .

It is not an unprimeable number, because it can be changed into a prime (28686869741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7171717435 + ... + 7171717438.

Almost surely, 2^28686869746 is an apocalyptic number.

28686869746 is a deficient number, since it is larger than the sum of its proper divisors (14343434876).

28686869746 is a wasteful number, since it uses less digits than its factorization.

28686869746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14343434875.

The product of its digits is 334430208, while the sum is 70.

The spelling of 28686869746 in words is "twenty-eight billion, six hundred eighty-six million, eight hundred sixty-nine thousand, seven hundred forty-six".