28923771 has 4 divisors (see below), whose sum is σ = 38565032. Its totient is φ = 19282512.

The previous prime is 28923709. The next prime is 28923779. The reversal of 28923771 is 17732982.

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

It is not a de Polignac number, because 28923771 - 2⁶ = 28923707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28923779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4820626 + ... + 4820631.

It is an arithmetic number, because the mean of its divisors is an integer number (9641258).

Almost surely, 2^28923771 is an apocalyptic number.

28923771 is a deficient number, since it is larger than the sum of its proper divisors (9641261).

28923771 is an equidigital number, since it uses as much as digits as its factorization.

28923771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9641260.

The product of its digits is 42336, while the sum is 39.

The square root of 28923771 is about 5378.0824649683. The cubic root of 28923771 is about 306.9622513684.

The spelling of 28923771 in words is "twenty-eight million, nine hundred twenty-three thousand, seven hundred seventy-one".