28364733531 has 12 divisors (see below), whose sum is σ = 40974316240. Its totient is φ = 18908421840.

The previous prime is 28364733521. The next prime is 28364733557. The reversal of 28364733531 is 13533746382.

28364733531 is a `hidden beast` number, since 2 + 83 + 6 + 4 + 7 + 33 + 531 = 666.

It is not a de Polignac number, because 28364733531 - 2¹⁹ = 28364209243 is a prime.

It is a super-2 number, since 2×28364733531² (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 (28364733521) 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, 19986 + ... + 239016.

Almost surely, 2^28364733531 is an apocalyptic number.

28364733531 is a deficient number, since it is larger than the sum of its proper divisors (12609582709).

28364733531 is a wasteful number, since it uses less digits than its factorization.

28364733531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233426 (or 233423 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 45.

The spelling of 28364733531 in words is "twenty-eight billion, three hundred sixty-four million, seven hundred thirty-three thousand, five hundred thirty-one".