28259712 has 256 divisors, whose sum is σ = 97675200. Its totient is φ = 7962624.

The previous prime is 28259681. The next prime is 28259719. The reversal of 28259712 is 21795282.

It is a super-2 number, since 2×28259712² = 1597222644645888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (20160) is a multiple of the sum of its prime divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28259719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 763758 + ... + 763794.

Almost surely, 2^28259712 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 28259712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48837600).

28259712 is an abundant number, since it is smaller than the sum of its proper divisors (69415488).

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

28259712 is a wasteful number, since it uses less digits than its factorization.

28259712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 72 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 28259712 is about 5315.9864559647. The cubic root of 28259712 is about 304.5948647617.

The spelling of 28259712 in words is "twenty-eight million, two hundred fifty-nine thousand, seven hundred twelve".