28642093 has 4 divisors (see below), whose sum is σ = 30326940. Its totient is φ = 26957248.

The previous prime is 28642091. The next prime is 28642099. The reversal of 28642093 is 39024682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39024682 = 2 ⋅19512341.

It can be written as a sum of positive squares in 2 ways, for example, as 26904969 + 1737124 = 5187^2 + 1318^2 .

It is a cyclic number.

It is not a de Polignac number, because 28642093 - 2¹ = 28642091 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28642091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842398 + ... + 842431.

It is an arithmetic number, because the mean of its divisors is an integer number (7581735).

Almost surely, 2^28642093 is an apocalyptic number.

It is an amenable number.

28642093 is a deficient number, since it is larger than the sum of its proper divisors (1684847).

28642093 is a wasteful number, since it uses less digits than its factorization.

28642093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684846.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28642093 is about 5351.8308082375. The cubic root of 28642093 is about 305.9625347498.

The spelling of 28642093 in words is "twenty-eight million, six hundred forty-two thousand, ninety-three".