28442693 has 4 divisors (see below), whose sum is σ = 28455660. Its totient is φ = 28429728.

The previous prime is 28442681. The next prime is 28442719. The reversal of 28442693 is 39624482.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24186724 + 4255969 = 4918^2 + 2063^2 .

It is a cyclic number.

It is not a de Polignac number, because 28442693 - 2¹⁰ = 28441669 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 (28442093) 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, 2288 + ... + 7881.

It is an arithmetic number, because the mean of its divisors is an integer number (7113915).

Almost surely, 2^28442693 is an apocalyptic number.

It is an amenable number.

28442693 is a deficient number, since it is larger than the sum of its proper divisors (12967).

28442693 is a wasteful number, since it uses less digits than its factorization.

28442693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12966.

The product of its digits is 82944, while the sum is 38.

The square root of 28442693 is about 5333.1691328890. The cubic root of 28442693 is about 305.2508658958.

The spelling of 28442693 in words is "twenty-eight million, four hundred forty-two thousand, six hundred ninety-three".