28709093 has 8 divisors (see below), whose sum is σ = 33429888. Its totient is φ = 24143184.

The previous prime is 28709071. The next prime is 28709113. The reversal of 28709093 is 39090782.

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 28709093 - 2⁶ = 28709029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28709033) 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, 38321 + ... + 39062.

It is an arithmetic number, because the mean of its divisors is an integer number (4178736).

Almost surely, 2^28709093 is an apocalyptic number.

It is an amenable number.

28709093 is a deficient number, since it is larger than the sum of its proper divisors (4720795).

28709093 is an equidigital number, since it uses as much as digits as its factorization.

28709093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77443.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 28709093 is about 5358.0866920945. The cubic root of 28709093 is about 306.2009196371.

The spelling of 28709093 in words is "twenty-eight million, seven hundred nine thousand, ninety-three".