28365685739 has 4 divisors (see below), whose sum is σ = 28369104624. Its totient is φ = 28362266856.

The previous prime is 28365685729. The next prime is 28365685759. The reversal of 28365685739 is 93758656382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93758656382 = 2 ⋅46879328191.

It is a cyclic number.

It is not a de Polignac number, because 28365685739 - 2⁴ = 28365685723 is a prime.

It is a super-2 number, since 2×28365685739² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28365685729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1696967 + ... + 1713600.

It is an arithmetic number, because the mean of its divisors is an integer number (7092276156).

Almost surely, 2^28365685739 is an apocalyptic number.

28365685739 is a deficient number, since it is larger than the sum of its proper divisors (3418885).

28365685739 is an equidigital number, since it uses as much as digits as its factorization.

28365685739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3418884.

The product of its digits is 65318400, while the sum is 62.

The spelling of 28365685739 in words is "twenty-eight billion, three hundred sixty-five million, six hundred eighty-five thousand, seven hundred thirty-nine".