28378027 has 4 divisors (see below), whose sum is σ = 29070216. Its totient is φ = 27685840.

The previous prime is 28378003. The next prime is 28378057. The reversal of 28378027 is 72087382.

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

It is a cyclic number.

It is not a de Polignac number, because 28378027 - 2¹⁹ = 27853739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28378057) 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, 346033 + ... + 346114.

It is an arithmetic number, because the mean of its divisors is an integer number (7267554).

Almost surely, 2^28378027 is an apocalyptic number.

28378027 is a deficient number, since it is larger than the sum of its proper divisors (692189).

28378027 is an equidigital number, since it uses as much as digits as its factorization.

28378027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692188.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 28378027 is about 5327.1030588867. The cubic root of 28378027 is about 305.0193555754.

The spelling of 28378027 in words is "twenty-eight million, three hundred seventy-eight thousand, twenty-seven".