28381679 has 4 divisors (see below), whose sum is σ = 28394640. Its totient is φ = 28368720.

The previous prime is 28381673. The next prime is 28381693. The reversal of 28381679 is 97618382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97618382 = 2 ⋅48809191.

It is a cyclic number.

It is not a de Polignac number, because 28381679 - 2⁴ = 28381663 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 (28381673) 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, 2294 + ... + 7875.

It is an arithmetic number, because the mean of its divisors is an integer number (7098660).

Almost surely, 2^28381679 is an apocalyptic number.

28381679 is a deficient number, since it is larger than the sum of its proper divisors (12961).

28381679 is a wasteful number, since it uses less digits than its factorization.

28381679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12960.

The product of its digits is 145152, while the sum is 44.

The square root of 28381679 is about 5327.4458232815. The cubic root of 28381679 is about 305.0324394414.

The spelling of 28381679 in words is "twenty-eight million, three hundred eighty-one thousand, six hundred seventy-nine".