28216634229 has 20 divisors (see below), whose sum is σ = 48172314784. Its totient is φ = 16123790664.

The previous prime is 28216634203. The next prime is 28216634233. The reversal of 28216634229 is 92243661282.

28216634229 is a `hidden beast` number, since 2 + 8 + 2 + 1 + 6 + 634 + 2 + 2 + 9 = 666.

It is not a de Polignac number, because 28216634229 - 2¹³ = 28216626037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28216634729) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24881827 + ... + 24882960.

Almost surely, 2^28216634229 is an apocalyptic number.

It is an amenable number.

28216634229 is a deficient number, since it is larger than the sum of its proper divisors (19955680555).

28216634229 is an equidigital number, since it uses as much as digits as its factorization.

28216634229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49764806 (or 49764797 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The spelling of 28216634229 in words is "twenty-eight billion, two hundred sixteen million, six hundred thirty-four thousand, two hundred twenty-nine".