28993793 has 4 divisors (see below), whose sum is σ = 29029680. Its totient is φ = 28957908.

The previous prime is 28993787. The next prime is 28993799. The reversal of 28993793 is 39739982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (28993787) and next prime (28993799).

It is a cyclic number.

It is not a de Polignac number, because 28993793 - 2¹⁶ = 28928257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28993799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16703 + ... + 18356.

It is an arithmetic number, because the mean of its divisors is an integer number (7257420).

Almost surely, 2^28993793 is an apocalyptic number.

It is an amenable number.

28993793 is a deficient number, since it is larger than the sum of its proper divisors (35887).

28993793 is an equidigital number, since it uses as much as digits as its factorization.

28993793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35886.

The product of its digits is 734832, while the sum is 50.

The square root of 28993793 is about 5384.5884708119. The cubic root of 28993793 is about 307.2097616131.

The spelling of 28993793 in words is "twenty-eight million, nine hundred ninety-three thousand, seven hundred ninety-three".