28116729 has 12 divisors (see below), whose sum is σ = 40685632. Its totient is φ = 18711000.

The previous prime is 28116727. The next prime is 28116757. The reversal of 28116729 is 92761182.

It is not a de Polignac number, because 28116729 - 2¹ = 28116727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28116693 and 28116702.

It is not an unprimeable number, because it can be changed into a prime (28116727) 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, 3204 + ... + 8154.

Almost surely, 2^28116729 is an apocalyptic number.

It is an amenable number.

28116729 is a deficient number, since it is larger than the sum of its proper divisors (12568903).

28116729 is a wasteful number, since it uses less digits than its factorization.

28116729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5588 (or 5585 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 28116729 is about 5302.5210042017. The cubic root of 28116729 is about 304.0802859565.

The spelling of 28116729 in words is "twenty-eight million, one hundred sixteen thousand, seven hundred twenty-nine".