28956923 has 8 divisors (see below), whose sum is σ = 29331120. Its totient is φ = 28585440.

The previous prime is 28956919. The next prime is 28956953. The reversal of 28956923 is 32965982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28956923 - 2² = 28956919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28956953) 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 7 ways as a sum of consecutive naturals, for example, 27908 + ... + 28926.

It is an arithmetic number, because the mean of its divisors is an integer number (3666390).

Almost surely, 2^28956923 is an apocalyptic number.

28956923 is a deficient number, since it is larger than the sum of its proper divisors (374197).

28956923 is a wasteful number, since it uses less digits than its factorization.

28956923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357.

The product of its digits is 233280, while the sum is 44.

The square root of 28956923 is about 5381.1637217241. The cubic root of 28956923 is about 307.0794851253.

The spelling of 28956923 in words is "twenty-eight million, nine hundred fifty-six thousand, nine hundred twenty-three".