28355831836 has 24 divisors (see below), whose sum is σ = 52688089440. Its totient is φ = 13306739712.

The previous prime is 28355831771. The next prime is 28355831863. The reversal of 28355831836 is 63813855382.

It is a happy number.

It is a super-2 number, since 2×28355831836² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556365 + ... + 605188.

It is an arithmetic number, because the mean of its divisors is an integer number (2195337060).

Almost surely, 2^28355831836 is an apocalyptic number.

It is an amenable number.

28355831836 is a deficient number, since it is larger than the sum of its proper divisors (24332257604).

28355831836 is a wasteful number, since it uses less digits than its factorization.

28355831836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161933 (or 1161931 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 52.

The spelling of 28355831836 in words is "twenty-eight billion, three hundred fifty-five million, eight hundred thirty-one thousand, eight hundred thirty-six".