28378579 has 2 divisors, whose sum is σ = 28378580. Its totient is φ = 28378578.

The previous prime is 28378577. The next prime is 28378607. The reversal of 28378579 is 97587382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28378579 - 2¹ = 28378577 is a prime.

It is a super-3 number, since 3×28378579³ (a number of 23 digits) contains 333 as substring.

Together with 28378577, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28378577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14189289 + 14189290.

It is an arithmetic number, because the mean of its divisors is an integer number (14189290).

Almost surely, 2^28378579 is an apocalyptic number.

28378579 is a deficient number, since it is larger than the sum of its proper divisors (1).

28378579 is an equidigital number, since it uses as much as digits as its factorization.

28378579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 28378579 is about 5327.1548691586. The cubic root of 28378579 is about 305.0213332744.

The spelling of 28378579 in words is "twenty-eight million, three hundred seventy-eight thousand, five hundred seventy-nine".