28728323 has 16 divisors (see below), whose sum is σ = 32901120. Its totient is φ = 24865056.

The previous prime is 28728319. The next prime is 28728341. The reversal of 28728323 is 32382782.

It is a cyclic number.

It is not a de Polignac number, because 28728323 - 2² = 28728319 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 15 ways as a sum of consecutive naturals, for example, 25886 + ... + 26972.

It is an arithmetic number, because the mean of its divisors is an integer number (2056320).

Almost surely, 2^28728323 is an apocalyptic number.

28728323 is a deficient number, since it is larger than the sum of its proper divisors (4172797).

28728323 is a wasteful number, since it uses less digits than its factorization.

28728323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226.

The product of its digits is 32256, while the sum is 35.

The square root of 28728323 is about 5359.8808755419. The cubic root of 28728323 is about 306.2692711461.

The spelling of 28728323 in words is "twenty-eight million, seven hundred twenty-eight thousand, three hundred twenty-three".