28340493 has 4 divisors (see below), whose sum is σ = 37787328. Its totient is φ = 18893660.

The previous prime is 28340491. The next prime is 28340503. The reversal of 28340493 is 39404382.

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 a cyclic number.

It is not a de Polignac number, because 28340493 - 2¹ = 28340491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28340491) 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, 4723413 + ... + 4723418.

It is an arithmetic number, because the mean of its divisors is an integer number (9446832).

Almost surely, 2^28340493 is an apocalyptic number.

It is an amenable number.

28340493 is a deficient number, since it is larger than the sum of its proper divisors (9446835).

28340493 is an equidigital number, since it uses as much as digits as its factorization.

28340493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9446834.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 28340493 is about 5323.5789653202. The cubic root of 28340493 is about 304.8848190004.

The spelling of 28340493 in words is "twenty-eight million, three hundred forty thousand, four hundred ninety-three".