28978327 has 4 divisors (see below), whose sum is σ = 33118096. Its totient is φ = 24838560.

The previous prime is 28978307. The next prime is 28978343. The reversal of 28978327 is 72387982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72387982 = 2 ⋅36193991.

It is a cyclic number.

It is not a de Polignac number, because 28978327 - 2⁷ = 28978199 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 (28978307) 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, 2069874 + ... + 2069887.

It is an arithmetic number, because the mean of its divisors is an integer number (8279524).

Almost surely, 2^28978327 is an apocalyptic number.

28978327 is a deficient number, since it is larger than the sum of its proper divisors (4139769).

28978327 is an equidigital number, since it uses as much as digits as its factorization.

28978327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139768.

The product of its digits is 338688, while the sum is 46.

The square root of 28978327 is about 5383.1521434936. The cubic root of 28978327 is about 307.1551274915.

The spelling of 28978327 in words is "twenty-eight million, nine hundred seventy-eight thousand, three hundred twenty-seven".