28561712 has 40 divisors (see below), whose sum is σ = 59520000. Its totient is φ = 13234752.

The previous prime is 28561691. The next prime is 28561727. The reversal of 28561712 is 21716582.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13289 + ... + 15287.

It is an arithmetic number, because the mean of its divisors is an integer number (1488000).

Almost surely, 2^28561712 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 28561712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29760000).

28561712 is an abundant number, since it is smaller than the sum of its proper divisors (30958288).

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

28561712 is a wasteful number, since it uses less digits than its factorization.

28561712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073 (or 2067 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 28561712 is about 5344.3158589290. The cubic root of 28561712 is about 305.6760494377.

The spelling of 28561712 in words is "twenty-eight million, five hundred sixty-one thousand, seven hundred twelve".