28892729 has 4 divisors (see below), whose sum is σ = 29889060. Its totient is φ = 27896400.

The previous prime is 28892723. The next prime is 28892737. The reversal of 28892729 is 92729882.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5107600 + 23785129 = 2260^2 + 4877^2 .

It is a cyclic number.

It is not a de Polignac number, because 28892729 - 2¹⁶ = 28827193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28892723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498122 + ... + 498179.

It is an arithmetic number, because the mean of its divisors is an integer number (7472265).

Almost surely, 2^28892729 is an apocalyptic number.

28892729 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28892729 is a deficient number, since it is larger than the sum of its proper divisors (996331).

28892729 is an equidigital number, since it uses as much as digits as its factorization.

28892729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996330.

The product of its digits is 290304, while the sum is 47.

The square root of 28892729 is about 5375.1957173669. The cubic root of 28892729 is about 306.8523978608.

The spelling of 28892729 in words is "twenty-eight million, eight hundred ninety-two thousand, seven hundred twenty-nine".