28229398731 has 12 divisors (see below), whose sum is σ = 40782857440. Its totient is φ = 18816341040.

The previous prime is 28229398711. The next prime is 28229398753. The reversal of 28229398731 is 13789392282.

28229398731 is a `hidden beast` number, since 28 + 229 + 398 + 7 + 3 + 1 = 666.

It is not a de Polignac number, because 28229398731 - 2¹⁷ = 28229267659 is a prime.

It is a super-2 number, since 2×28229398731² (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 (28229398711) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 216040 + ... + 321141.

Almost surely, 2^28229398731 is an apocalyptic number.

28229398731 is a deficient number, since it is larger than the sum of its proper divisors (12553458709).

28229398731 is a wasteful number, since it uses less digits than its factorization.

28229398731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543026 (or 543023 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The spelling of 28229398731 in words is "twenty-eight billion, two hundred twenty-nine million, three hundred ninety-eight thousand, seven hundred thirty-one".