28388463 has 16 divisors (see below), whose sum is σ = 39626496. Its totient is φ = 18043520.

The previous prime is 28388449. The next prime is 28388473. The reversal of 28388463 is 36488382.

It is a cyclic number.

It is not a de Polignac number, because 28388463 - 2⁴ = 28388447 is a prime.

It is a Smith number, since the sum of its digits (42) 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 (28388473) 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, 31783 + ... + 32663.

It is an arithmetic number, because the mean of its divisors is an integer number (2476656).

Almost surely, 2^28388463 is an apocalyptic number.

28388463 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28388463 is a deficient number, since it is larger than the sum of its proper divisors (11238033).

28388463 is a wasteful number, since it uses less digits than its factorization.

28388463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374.

The product of its digits is 221184, while the sum is 42.

The square root of 28388463 is about 5328.0824881002. The cubic root of 28388463 is about 305.0567412126.

The spelling of 28388463 in words is "twenty-eight million, three hundred eighty-eight thousand, four hundred sixty-three".