28190993769 has 12 divisors (see below), whose sum is σ = 40825008900. Its totient is φ = 18745679904.

The previous prime is 28190993759. The next prime is 28190993797. The reversal of 28190993769 is 96739909182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14853515625 + 13337478144 = 121875^2 + 115488^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28190993769 is a prime.

It is a super-2 number, since 2×28190993769² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28190993759) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4022634 + ... + 4029635.

It is an arithmetic number, because the mean of its divisors is an integer number (3402084075).

Almost surely, 2^28190993769 is an apocalyptic number.

It is an amenable number.

28190993769 is a deficient number, since it is larger than the sum of its proper divisors (12634015131).

28190993769 is a wasteful number, since it uses less digits than its factorization.

28190993769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8052664 (or 8052661 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 63.

The spelling of 28190993769 in words is "twenty-eight billion, one hundred ninety million, nine hundred ninety-three thousand, seven hundred sixty-nine".