28761663 has 16 divisors (see below), whose sum is σ = 44016896. Its totient is φ = 16364160.

The previous prime is 28761659. The next prime is 28761673. The reversal of 28761663 is 36616782.

It is not a de Polignac number, because 28761663 - 2² = 28761659 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28761653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2220 + ... + 7902.

It is an arithmetic number, because the mean of its divisors is an integer number (2751056).

Almost surely, 2^28761663 is an apocalyptic number.

28761663 is a deficient number, since it is larger than the sum of its proper divisors (15255233).

28761663 is a wasteful number, since it uses less digits than its factorization.

28761663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5934.

The product of its digits is 72576, while the sum is 39.

The square root of 28761663 is about 5362.9901174625. The cubic root of 28761663 is about 306.3877032823.

The spelling of 28761663 in words is "twenty-eight million, seven hundred sixty-one thousand, six hundred sixty-three".