28043331 has 8 divisors (see below), whose sum is σ = 37426704. Its totient is φ = 18677760.

The previous prime is 28043329. The next prime is 28043339. The reversal of 28043331 is 13334082.

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

It is not a de Polignac number, because 28043331 - 2¹ = 28043329 is a prime.

It is a super-2 number, since 2×28043331² = 1572856827151122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28043339) 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 7 ways as a sum of consecutive naturals, for example, 190 + ... + 7491.

It is an arithmetic number, because the mean of its divisors is an integer number (4678338).

Almost surely, 2^28043331 is an apocalyptic number.

28043331 is a deficient number, since it is larger than the sum of its proper divisors (9383373).

28043331 is a wasteful number, since it uses less digits than its factorization.

28043331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8901.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 28043331 is about 5295.5954339432. The cubic root of 28043331 is about 303.8154574506.

The spelling of 28043331 in words is "twenty-eight million, forty-three thousand, three hundred thirty-one".