28329423 has 4 divisors (see below), whose sum is σ = 37772568. Its totient is φ = 18886280.

The previous prime is 28329421. The next prime is 28329461. The reversal of 28329423 is 32492382.

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 28329423 - 2¹ = 28329421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28329421) 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, 4721568 + ... + 4721573.

It is an arithmetic number, because the mean of its divisors is an integer number (9443142).

Almost surely, 2^28329423 is an apocalyptic number.

28329423 is a deficient number, since it is larger than the sum of its proper divisors (9443145).

28329423 is an equidigital number, since it uses as much as digits as its factorization.

28329423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9443144.

The product of its digits is 20736, while the sum is 33.

The square root of 28329423 is about 5322.5391496916. The cubic root of 28329423 is about 304.8451170977.

The spelling of 28329423 in words is "twenty-eight million, three hundred twenty-nine thousand, four hundred twenty-three".