28474993 has 4 divisors (see below), whose sum is σ = 28957680. Its totient is φ = 27992308.

The previous prime is 28474981. The next prime is 28475009. The reversal of 28474993 is 39947482.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39947482 = 2 ⋅19973741.

It is a cyclic number.

It is not a de Polignac number, because 28474993 - 2⁵ = 28474961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28474913) 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, 241255 + ... + 241372.

It is an arithmetic number, because the mean of its divisors is an integer number (7239420).

Almost surely, 2^28474993 is an apocalyptic number.

It is an amenable number.

28474993 is a deficient number, since it is larger than the sum of its proper divisors (482687).

28474993 is an equidigital number, since it uses as much as digits as its factorization.

28474993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482686.

The product of its digits is 435456, while the sum is 46.

The square root of 28474993 is about 5336.1964918845. The cubic root of 28474993 is about 305.3663715206.

The spelling of 28474993 in words is "twenty-eight million, four hundred seventy-four thousand, nine hundred ninety-three".