28229779 has 4 divisors (see below), whose sum is σ = 28992784. Its totient is φ = 27466776.

The previous prime is 28229777. The next prime is 28229827. The reversal of 28229779 is 97792282.

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 28229779 - 2¹ = 28229777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28229777) 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, 381447 + ... + 381520.

It is an arithmetic number, because the mean of its divisors is an integer number (7248196).

Almost surely, 2^28229779 is an apocalyptic number.

28229779 is a deficient number, since it is larger than the sum of its proper divisors (763005).

28229779 is an equidigital number, since it uses as much as digits as its factorization.

28229779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763004.

The product of its digits is 254016, while the sum is 46.

The square root of 28229779 is about 5313.1703341790. The cubic root of 28229779 is about 304.4872833506.

It can be divided in two parts, 282297 and 79, that added together give a triangular number (282376 = T₇₅₁).

The spelling of 28229779 in words is "twenty-eight million, two hundred twenty-nine thousand, seven hundred seventy-nine".