28128363 has 4 divisors (see below), whose sum is σ = 37504488. Its totient is φ = 18752240.

The previous prime is 28128349. The next prime is 28128367. The reversal of 28128363 is 36382182.

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 28128363 - 2⁹ = 28127851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28128367) 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, 4688058 + ... + 4688063.

It is an arithmetic number, because the mean of its divisors is an integer number (9376122).

Almost surely, 2^28128363 is an apocalyptic number.

28128363 is a deficient number, since it is larger than the sum of its proper divisors (9376125).

28128363 is an equidigital number, since it uses as much as digits as its factorization.

28128363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9376124.

The product of its digits is 13824, while the sum is 33.

The square root of 28128363 is about 5303.6179161022. The cubic root of 28128363 is about 304.1222204484.

It can be divided in two parts, 2812 and 8363, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 28128363 in words is "twenty-eight million, one hundred twenty-eight thousand, three hundred sixty-three".