28656712 has 64 divisors (see below), whose sum is σ = 67507200. Its totient is φ = 11119680.

The previous prime is 28656709. The next prime is 28656721. The reversal of 28656712 is 21765682.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23887 + ... + 25057.

It is an arithmetic number, because the mean of its divisors is an integer number (1054800).

Almost surely, 2^28656712 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 28656712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33753600).

28656712 is an abundant number, since it is smaller than the sum of its proper divisors (38850488).

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

28656712 is a wasteful number, since it uses less digits than its factorization.

28656712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226 (or 1222 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 28656712 is about 5353.1964283034. The cubic root of 28656712 is about 306.0145805916.

The spelling of 28656712 in words is "twenty-eight million, six hundred fifty-six thousand, seven hundred twelve".