28129835 has 4 divisors (see below), whose sum is σ = 33755808. Its totient is φ = 22503864.

The previous prime is 28129831. The next prime is 28129841. The reversal of 28129835 is 53892182.

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

It is a cyclic number.

It is not a de Polignac number, because 28129835 - 2² = 28129831 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28129831) 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, 2812979 + ... + 2812988.

It is an arithmetic number, because the mean of its divisors is an integer number (8438952).

Almost surely, 2^28129835 is an apocalyptic number.

28129835 is a deficient number, since it is larger than the sum of its proper divisors (5625973).

28129835 is an equidigital number, since it uses as much as digits as its factorization.

28129835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5625972.

The product of its digits is 34560, while the sum is 38.

The square root of 28129835 is about 5303.7566874811. The cubic root of 28129835 is about 304.1275254152.

The spelling of 28129835 in words is "twenty-eight million, one hundred twenty-nine thousand, eight hundred thirty-five".