28232712 has 112 divisors (see below), whose sum is σ = 81843840. Its totient is φ = 9121248.

The previous prime is 28232683. The next prime is 28232713. The reversal of 28232712 is 21723282.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28232713) 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 27 ways as a sum of consecutive naturals, for example, 274053 + ... + 274155.

Almost surely, 2^28232712 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 28232712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40921920).

28232712 is an abundant number, since it is smaller than the sum of its proper divisors (53611128).

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

28232712 is a wasteful number, since it uses less digits than its factorization.

28232712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 155 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 28232712 is about 5313.4463392416. The cubic root of 28232712 is about 304.4978281288.

Adding to 28232712 its reverse (21723282), we get a palindrome (49955994).

The spelling of 28232712 in words is "twenty-eight million, two hundred thirty-two thousand, seven hundred twelve".