28728201 has 16 divisors (see below), whose sum is σ = 39064896. Its totient is φ = 18775296.

The previous prime is 28728197. The next prime is 28728211. The reversal of 28728201 is 10282782.

It is a happy number.

It is not a de Polignac number, because 28728201 - 2² = 28728197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28728211) 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, 50746 + ... + 51308.

It is an arithmetic number, because the mean of its divisors is an integer number (2441556).

Almost surely, 2^28728201 is an apocalyptic number.

It is an amenable number.

28728201 is a deficient number, since it is larger than the sum of its proper divisors (10336695).

28728201 is a wasteful number, since it uses less digits than its factorization.

28728201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28728201 is about 5359.8694946799. The cubic root of 28728201 is about 306.2688376029.

The spelling of 28728201 in words is "twenty-eight million, seven hundred twenty-eight thousand, two hundred one".