28728363 has 4 divisors (see below), whose sum is σ = 38304488. Its totient is φ = 19152240.

The previous prime is 28728353. The next prime is 28728373. The reversal of 28728363 is 36382782.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (28728353) and next prime (28728373).

It is not a de Polignac number, because 28728363 - 2¹⁸ = 28466219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28728353) 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, 4788058 + ... + 4788063.

It is an arithmetic number, because the mean of its divisors is an integer number (9576122).

Almost surely, 2^28728363 is an apocalyptic number.

28728363 is a deficient number, since it is larger than the sum of its proper divisors (9576125).

28728363 is an equidigital number, since it uses as much as digits as its factorization.

28728363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9576124.

The product of its digits is 96768, while the sum is 39.

The square root of 28728363 is about 5359.8846069668. The cubic root of 28728363 is about 306.2694132911.

The spelling of 28728363 in words is "twenty-eight million, seven hundred twenty-eight thousand, three hundred sixty-three".