28942093 has 4 divisors (see below), whose sum is σ = 28952860. Its totient is φ = 28931328.

The previous prime is 28942063. The next prime is 28942097. The reversal of 28942093 is 39024982.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8988004 + 19954089 = 2998^2 + 4467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28942093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28942097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2413 + ... + 7981.

It is an arithmetic number, because the mean of its divisors is an integer number (7238215).

Almost surely, 2^28942093 is an apocalyptic number.

It is an amenable number.

28942093 is a deficient number, since it is larger than the sum of its proper divisors (10767).

28942093 is an equidigital number, since it uses as much as digits as its factorization.

28942093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10766.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 28942093 is about 5379.7855905231. The cubic root of 28942093 is about 307.0270536059.

The spelling of 28942093 in words is "twenty-eight million, nine hundred forty-two thousand, ninety-three".