28905612 has 48 divisors (see below), whose sum is σ = 71783040. Its totient is φ = 9027072.

The previous prime is 28905599. The next prime is 28905623. The reversal of 28905612 is 21650982.

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, 21463 + ... + 22769.

It is an arithmetic number, because the mean of its divisors is an integer number (1495480).

Almost surely, 2^28905612 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 28905612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35891520).

28905612 is an abundant number, since it is smaller than the sum of its proper divisors (42877428).

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

28905612 is a wasteful number, since it uses less digits than its factorization.

28905612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430 (or 1428 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 28905612 is about 5376.3939587794. The cubic root of 28905612 is about 306.8979986303.

The spelling of 28905612 in words is "twenty-eight million, nine hundred five thousand, six hundred twelve".