28577172 has 48 divisors (see below), whose sum is σ = 73764992. Its totient is φ = 8553600.

The previous prime is 28577161. The next prime is 28577173. The reversal of 28577172 is 27177582.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 28577172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28577173) 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 15 ways as a sum of consecutive naturals, for example, 3297 + ... + 8247.

Almost surely, 2^28577172 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 28577172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36882496).

28577172 is an abundant number, since it is smaller than the sum of its proper divisors (45187820).

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

28577172 is a wasteful number, since it uses less digits than its factorization.

28577172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5008 (or 5006 counting only the distinct ones).

The product of its digits is 54880, while the sum is 39.

The square root of 28577172 is about 5345.7620598003. The cubic root of 28577172 is about 305.7311920160.

The spelling of 28577172 in words is "twenty-eight million, five hundred seventy-seven thousand, one hundred seventy-two".