28933143 has 8 divisors (see below), whose sum is σ = 40608000. Its totient is φ = 18273528.

The previous prime is 28933129. The next prime is 28933169. The reversal of 28933143 is 34133982.

It is a happy number.

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

It is not a de Polignac number, because 28933143 - 2¹⁷ = 28802071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28933123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253743 + ... + 253856.

It is an arithmetic number, because the mean of its divisors is an integer number (5076000).

Almost surely, 2^28933143 is an apocalyptic number.

28933143 is a deficient number, since it is larger than the sum of its proper divisors (11674857).

28933143 is a wasteful number, since it uses less digits than its factorization.

28933143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507621.

The product of its digits is 15552, while the sum is 33.

The square root of 28933143 is about 5378.9537086686. The cubic root of 28933143 is about 306.9954021812.

The spelling of 28933143 in words is "twenty-eight million, nine hundred thirty-three thousand, one hundred forty-three".