28133701965 has 48 divisors (see below), whose sum is σ = 51721523568. Its totient is φ = 14097973248.

The previous prime is 28133701949. The next prime is 28133702011. The reversal of 28133701965 is 56910733182.

It can be written as a sum of positive squares in 8 ways, for example, as 6737618889 + 21396083076 = 82083^2 + 146274^2 .

It is not a de Polignac number, because 28133701965 - 2⁴ = 28133701949 is a prime.

It is a super-2 number, since 2×28133701965² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28133701965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 422637 + ... + 484653.

It is an arithmetic number, because the mean of its divisors is an integer number (1077531741).

Almost surely, 2^28133701965 is an apocalyptic number.

It is an amenable number.

28133701965 is a deficient number, since it is larger than the sum of its proper divisors (23587821603).

28133701965 is a wasteful number, since it uses less digits than its factorization.

28133701965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62638 (or 62635 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 28133701965 in words is "twenty-eight billion, one hundred thirty-three million, seven hundred one thousand, nine hundred sixty-five".