28263663 has 6 divisors (see below), whose sum is σ = 40825304. Its totient is φ = 18842436.

The previous prime is 28263649. The next prime is 28263667. The reversal of 28263663 is 36636282.

It is not a de Polignac number, because 28263663 - 2⁸ = 28263407 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 (28263667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1570195 + ... + 1570212.

Almost surely, 2^28263663 is an apocalyptic number.

28263663 is a deficient number, since it is larger than the sum of its proper divisors (12561641).

28263663 is a wasteful number, since it uses less digits than its factorization.

28263663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140413 (or 3140410 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 28263663 is about 5316.3580579190. The cubic root of 28263663 is about 304.6090592710.

The spelling of 28263663 in words is "twenty-eight million, two hundred sixty-three thousand, six hundred sixty-three".