28135712 has 48 divisors (see below), whose sum is σ = 61381152. Its totient is φ = 12587520.

The previous prime is 28135703. The next prime is 28135727. The reversal of 28135712 is 21753182.

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, 22988 + ... + 24180.

It is an arithmetic number, because the mean of its divisors is an integer number (1278774).

Almost surely, 2^28135712 is an apocalyptic number.

28135712 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28135712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30690576).

28135712 is an abundant number, since it is smaller than the sum of its proper divisors (33245440).

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

28135712 is a wasteful number, since it uses less digits than its factorization.

28135712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281 (or 1273 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 28135712 is about 5304.3106997988. The cubic root of 28135712 is about 304.1487037952.

Adding to 28135712 its reverse (21753182), we get a palindrome (49888894).

The spelling of 28135712 in words is "twenty-eight million, one hundred thirty-five thousand, seven hundred twelve".