28765691036 has 12 divisors (see below), whose sum is σ = 50345416128. Its totient is φ = 14381286432.

The previous prime is 28765691029. The next prime is 28765691077. The reversal of 28765691036 is 63019656782.

It is a super-2 number, since 2×28765691036² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347756 + ... + 422451.

It is an arithmetic number, because the mean of its divisors is an integer number (4195451344).

Almost surely, 2^28765691036 is an apocalyptic number.

It is an amenable number.

28765691036 is a deficient number, since it is larger than the sum of its proper divisors (21579725092).

28765691036 is a wasteful number, since it uses less digits than its factorization.

28765691036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779548 (or 779546 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 28765691036 in words is "twenty-eight billion, seven hundred sixty-five million, six hundred ninety-one thousand, thirty-six".