28788663 has 8 divisors (see below), whose sum is σ = 40053888. Its totient is φ = 18357944.

The previous prime is 28788659. The next prime is 28788673. The reversal of 28788663 is 36688782.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28788663 - 2² = 28788659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28788653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208545 + ... + 208682.

It is an arithmetic number, because the mean of its divisors is an integer number (5006736).

Almost surely, 2^28788663 is an apocalyptic number.

28788663 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28788663 is a deficient number, since it is larger than the sum of its proper divisors (11265225).

28788663 is a wasteful number, since it uses less digits than its factorization.

28788663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417253.

The product of its digits is 774144, while the sum is 48.

The square root of 28788663 is about 5365.5067794198. The cubic root of 28788663 is about 306.4835470767.

The spelling of 28788663 in words is "twenty-eight million, seven hundred eighty-eight thousand, six hundred sixty-three".