28079993 has 2 divisors, whose sum is σ = 28079994. Its totient is φ = 28079992.

The previous prime is 28079977. The next prime is 28079999. The reversal of 28079993 is 39997082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23551609 + 4528384 = 4853^2 + 2128^2 .

It is a cyclic number.

It is not a de Polignac number, because 28079993 - 2⁴ = 28079977 is a prime.

It is not a weakly prime, because it can be changed into another prime (28079999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14039996 + 14039997.

It is an arithmetic number, because the mean of its divisors is an integer number (14039997).

Almost surely, 2^28079993 is an apocalyptic number.

It is an amenable number.

28079993 is a deficient number, since it is larger than the sum of its proper divisors (1).

28079993 is an equidigital number, since it uses as much as digits as its factorization.

28079993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 28079993 is about 5299.0558593017. The cubic root of 28079993 is about 303.9477958892.

The spelling of 28079993 in words is "twenty-eight million, seventy-nine thousand, nine hundred ninety-three".