28998729 has 20 divisors (see below), whose sum is σ = 44036740. Its totient is φ = 19012320.

The previous prime is 28998721. The next prime is 28998737. The reversal of 28998729 is 92789982.

It is an interprime number because it is at equal distance from previous prime (28998721) and next prime (28998737).

It can be written as a sum of positive squares in 2 ways, for example, as 1750329 + 27248400 = 1323^2 + 5220^2 .

It is not a de Polignac number, because 28998729 - 2³ = 28998721 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 (28998721) 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, 2007 + ... + 7875.

It is an arithmetic number, because the mean of its divisors is an integer number (2201837).

Almost surely, 2^28998729 is an apocalyptic number.

It is an amenable number.

28998729 is a deficient number, since it is larger than the sum of its proper divisors (15038011).

28998729 is an equidigital number, since it uses as much as digits as its factorization.

28998729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5942 (or 5933 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 28998729 is about 5385.0467964540. The cubic root of 28998729 is about 307.2271940953.

It can be divided in two parts, 2899 and 8729, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 28998729 in words is "twenty-eight million, nine hundred ninety-eight thousand, seven hundred twenty-nine".