28801663 has 12 divisors (see below), whose sum is σ = 33165288. Its totient is φ = 24801840.

The previous prime is 28801649. The next prime is 28801673. The reversal of 28801663 is 36610882.

It is not a de Polignac number, because 28801663 - 2¹⁷ = 28670591 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 (28801603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 345 + ... + 7597.

It is an arithmetic number, because the mean of its divisors is an integer number (2763774).

Almost surely, 2^28801663 is an apocalyptic number.

28801663 is a deficient number, since it is larger than the sum of its proper divisors (4363625).

28801663 is a wasteful number, since it uses less digits than its factorization.

28801663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7302 (or 7283 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28801663 is about 5366.7180846398. The cubic root of 28801663 is about 306.5296727169.

The spelling of 28801663 in words is "twenty-eight million, eight hundred one thousand, six hundred sixty-three".