28643424 has 24 divisors (see below), whose sum is σ = 75189240. Its totient is φ = 9547776.

The previous prime is 28643423. The next prime is 28643429. The reversal of 28643424 is 42434682.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28643423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149089 + ... + 149280.

It is an arithmetic number, because the mean of its divisors is an integer number (3132885).

Almost surely, 2^28643424 is an apocalyptic number.

28643424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28643424 is an abundant number, since it is smaller than the sum of its proper divisors (46545816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28643424 is a wasteful number, since it uses less digits than its factorization.

28643424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298382 (or 298374 counting only the distinct ones).

The product of its digits is 36864, while the sum is 33.

The square root of 28643424 is about 5351.9551567628. The cubic root of 28643424 is about 305.9672740430.

The spelling of 28643424 in words is "twenty-eight million, six hundred forty-three thousand, four hundred twenty-four".