28643472 has 180 divisors, whose sum is σ = 95578704. Its totient is φ = 7937280.

The previous prime is 28643471. The next prime is 28643519. The reversal of 28643472 is 27434682.

28643472 is a `hidden beast` number, since 2 + 8 + 643 + 4 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28643471) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 267643 + ... + 267749.

Almost surely, 2^28643472 is an apocalyptic number.

28643472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28643472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47789352).

28643472 is an abundant number, since it is smaller than the sum of its proper divisors (66935232).

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

28643472 is a wasteful number, since it uses less digits than its factorization.

28643472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 136 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 28643472 is about 5351.9596411034. The cubic root of 28643472 is about 305.9674449539.

It can be divided in two parts, 2864 and 3472, that added together give a palindrome (6336).

The spelling of 28643472 in words is "twenty-eight million, six hundred forty-three thousand, four hundred seventy-two".