28393049 has 4 divisors (see below), whose sum is σ = 29887440. Its totient is φ = 26898660.

The previous prime is 28393037. The next prime is 28393051. The reversal of 28393049 is 94039382.

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: 94039382 = 2 ⋅47019691.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28393049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28393249) 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, 747167 + ... + 747204.

It is an arithmetic number, because the mean of its divisors is an integer number (7471860).

Almost surely, 2^28393049 is an apocalyptic number.

It is an amenable number.

28393049 is a deficient number, since it is larger than the sum of its proper divisors (1494391).

28393049 is a wasteful number, since it uses less digits than its factorization.

28393049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494390.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 28393049 is about 5328.5128319260. The cubic root of 28393049 is about 305.0731670742.

The spelling of 28393049 in words is "twenty-eight million, three hundred ninety-three thousand, forty-nine".