28706472 has 96 divisors (see below), whose sum is σ = 84240000. Its totient is φ = 8796672.

The previous prime is 28706441. The next prime is 28706477. The reversal of 28706472 is 27460782.

28706472 is a `hidden beast` number, since 2 + 8 + 7 + 0 + 647 + 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 (28706477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57279 + ... + 57777.

It is an arithmetic number, because the mean of its divisors is an integer number (877500).

Almost surely, 2^28706472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28706472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42120000).

28706472 is an abundant number, since it is smaller than the sum of its proper divisors (55533528).

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

28706472 is a wasteful number, since it uses less digits than its factorization.

28706472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 28706472 is about 5357.8421029366. The cubic root of 28706472 is about 306.1916011373.

The spelling of 28706472 in words is "twenty-eight million, seven hundred six thousand, four hundred seventy-two".