28513227 has 4 divisors (see below), whose sum is σ = 38017640. Its totient is φ = 19008816.

The previous prime is 28513213. The next prime is 28513229. The reversal of 28513227 is 72231582.

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

It is not a de Polignac number, because 28513227 - 2⁸ = 28512971 is a prime.

It is a super-2 number, since 2×28513227² = 1626008227907058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28513194 and 28513203.

It is not an unprimeable number, because it can be changed into a prime (28513229) 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, 4752202 + ... + 4752207.

It is an arithmetic number, because the mean of its divisors is an integer number (9504410).

Almost surely, 2^28513227 is an apocalyptic number.

28513227 is a deficient number, since it is larger than the sum of its proper divisors (9504413).

28513227 is an equidigital number, since it uses as much as digits as its factorization.

28513227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9504412.

The product of its digits is 6720, while the sum is 30.

The square root of 28513227 is about 5339.7778043660. Note that the first 3 decimals coincide. The cubic root of 28513227 is about 305.5029844444.

The spelling of 28513227 in words is "twenty-eight million, five hundred thirteen thousand, two hundred twenty-seven".