28378787 has 2 divisors, whose sum is σ = 28378788. Its totient is φ = 28378786.

The previous prime is 28378781. The next prime is 28378817. The reversal of 28378787 is 78787382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28378787 - 2¹⁴ = 28362403 is a prime.

It is not a weakly prime, because it can be changed into another prime (28378781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14189393 + 14189394.

It is an arithmetic number, because the mean of its divisors is an integer number (14189394).

Almost surely, 2^28378787 is an apocalyptic number.

28378787 is a deficient number, since it is larger than the sum of its proper divisors (1).

28378787 is an equidigital number, since it uses as much as digits as its factorization.

28378787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1053696, while the sum is 50.

The square root of 28378787 is about 5327.1743917390. The cubic root of 28378787 is about 305.0220784877.

The spelling of 28378787 in words is "twenty-eight million, three hundred seventy-eight thousand, seven hundred eighty-seven".