28917450 has 72 divisors (see below), whose sum is σ = 78343200. Its totient is φ = 7646880.

The previous prime is 28917443. The next prime is 28917467. The reversal of 28917450 is 5471982.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 80371 + ... + 80729.

It is an arithmetic number, because the mean of its divisors is an integer number (1088100).

Almost surely, 2^28917450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28917450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39171600).

28917450 is an abundant number, since it is smaller than the sum of its proper divisors (49425750).

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

28917450 is a wasteful number, since it uses less digits than its factorization.

28917450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 548 counting only the distinct ones).

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

The square root of 28917450 is about 5377.4947698719. The cubic root of 28917450 is about 306.9398885657.

The spelling of 28917450 in words is "twenty-eight million, nine hundred seventeen thousand, four hundred fifty".