28943730 has 96 divisors (see below), whose sum is σ = 80144064. Its totient is φ = 7511616.

The previous prime is 28943701. The next prime is 28943749. The reversal of 28943730 is 3734982.

28943730 is a `hidden beast` number, since 289 + 4 + 373 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 104352 + ... + 104628.

It is an arithmetic number, because the mean of its divisors is an integer number (834834).

Almost surely, 2^28943730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28943730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40072032).

28943730 is an abundant number, since it is smaller than the sum of its proper divisors (51200334).

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

28943730 is a wasteful number, since it uses less digits than its factorization.

28943730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 28943730 is about 5379.9377319817. The cubic root of 28943730 is about 307.0328421047.

The spelling of 28943730 in words is "twenty-eight million, nine hundred forty-three thousand, seven hundred thirty".