28722827 has 4 divisors (see below), whose sum is σ = 32826096. Its totient is φ = 24619560.

The previous prime is 28722817. The next prime is 28722853. The reversal of 28722827 is 72822782.

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

It is not a de Polignac number, because 28722827 - 2¹² = 28718731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28722817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2051624 + ... + 2051637.

It is an arithmetic number, because the mean of its divisors is an integer number (8206524).

Almost surely, 2^28722827 is an apocalyptic number.

28722827 is a deficient number, since it is larger than the sum of its proper divisors (4103269).

28722827 is an equidigital number, since it uses as much as digits as its factorization.

28722827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4103268.

The product of its digits is 50176, while the sum is 38.

The square root of 28722827 is about 5359.3681530569. The cubic root of 28722827 is about 306.2497391640.

The spelling of 28722827 in words is "twenty-eight million, seven hundred twenty-two thousand, eight hundred twenty-seven".