28040663 has 16 divisors (see below), whose sum is σ = 32956224. Its totient is φ = 23362560.

The previous prime is 28040659. The next prime is 28040699. The reversal of 28040663 is 36604082.

It is a cyclic number.

It is not a de Polignac number, because 28040663 - 2² = 28040659 is a prime.

It is a super-3 number, since 3×28040663³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28040603) 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, 41081 + ... + 41757.

It is an arithmetic number, because the mean of its divisors is an integer number (2059764).

Almost surely, 2^28040663 is an apocalyptic number.

28040663 is a deficient number, since it is larger than the sum of its proper divisors (4915561).

28040663 is an equidigital number, since it uses as much as digits as its factorization.

28040663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 28040663 is about 5295.3435204904. The cubic root of 28040663 is about 303.8058222977.

The spelling of 28040663 in words is "twenty-eight million, forty thousand, six hundred sixty-three".