28147712 has 32 divisors (see below), whose sum is σ = 56360100. Its totient is φ = 14057472.

The previous prime is 28147711. The next prime is 28147723. The reversal of 28147712 is 21774182.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28147711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32339 + ... + 33197.

Almost surely, 2^28147712 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 28147712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28180050).

28147712 is an abundant number, since it is smaller than the sum of its proper divisors (28212388).

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

28147712 is an frugal number, since it uses more digits than its factorization.

28147712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889 (or 861 counting only the distinct ones).

The product of its digits is 6272, while the sum is 32.

The square root of 28147712 is about 5305.4417346721. The cubic root of 28147712 is about 304.1919378849.

The spelling of 28147712 in words is "twenty-eight million, one hundred forty-seven thousand, seven hundred twelve".