28020463 has 4 divisors (see below), whose sum is σ = 29238768. Its totient is φ = 26802160.

The previous prime is 28020449. The next prime is 28020479. The reversal of 28020463 is 36402082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36402082 = 2 ⋅18201041.

It is a cyclic number.

It is not a de Polignac number, because 28020463 - 2²¹ = 25923311 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 (28020263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609118 + ... + 609163.

It is an arithmetic number, because the mean of its divisors is an integer number (7309692).

Almost surely, 2^28020463 is an apocalyptic number.

28020463 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28020463 is a deficient number, since it is larger than the sum of its proper divisors (1218305).

28020463 is a wasteful number, since it uses less digits than its factorization.

28020463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218304.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 28020463 is about 5293.4358407371. The cubic root of 28020463 is about 303.7328526508.

The spelling of 28020463 in words is "twenty-eight million, twenty thousand, four hundred sixty-three".