28778663 has 2 divisors, whose sum is σ = 28778664. Its totient is φ = 28778662.

The previous prime is 28778657. The next prime is 28778669. The reversal of 28778663 is 36687782.

It is a balanced prime because it is at equal distance from previous prime (28778657) and next prime (28778669).

It is a cyclic number.

It is not a de Polignac number, because 28778663 - 2⁴ = 28778647 is a prime.

It is a super-2 number, since 2×28778663² = 1656422888135138, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28778669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14389331 + 14389332.

It is an arithmetic number, because the mean of its divisors is an integer number (14389332).

Almost surely, 2^28778663 is an apocalyptic number.

28778663 is a deficient number, since it is larger than the sum of its proper divisors (1).

28778663 is an equidigital number, since it uses as much as digits as its factorization.

28778663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 47.

The square root of 28778663 is about 5364.5748200580. The cubic root of 28778663 is about 306.4480563651.

The spelling of 28778663 in words is "twenty-eight million, seven hundred seventy-eight thousand, six hundred sixty-three".