28605312 has 160 divisors (see below), whose sum is σ = 88862400. Its totient is φ = 9123840.

The previous prime is 28605301. The next prime is 28605349. The reversal of 28605312 is 21350682.

28605312 is a `hidden beast` number, since 28 + 605 + 31 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 321364 + ... + 321452.

It is an arithmetic number, because the mean of its divisors is an integer number (555390).

Almost surely, 2^28605312 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 28605312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44431200).

28605312 is an abundant number, since it is smaller than the sum of its proper divisors (60257088).

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

28605312 is an equidigital number, since it uses as much as digits as its factorization.

28605312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28605312 is about 5348.3934036307. The cubic root of 28605312 is about 305.8315104730.

Adding to 28605312 its reverse (21350682), we get a palindrome (49955994).

The spelling of 28605312 in words is "twenty-eight million, six hundred five thousand, three hundred twelve".