28385658 has 96 divisors (see below), whose sum is σ = 75479040. Its totient is φ = 7529760.

The previous prime is 28385647. The next prime is 28385659. The reversal of 28385658 is 85658382.

It is a happy number.

28385658 is a `hidden beast` number, since 2 + 83 + 8 + 565 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (28385659) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 169891 + ... + 170057.

It is an arithmetic number, because the mean of its divisors is an integer number (786240).

Almost surely, 2^28385658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28385658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37739520).

28385658 is an abundant number, since it is smaller than the sum of its proper divisors (47093382).

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

28385658 is a wasteful number, since it uses less digits than its factorization.

28385658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 269 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The square root of 28385658 is about 5327.8192536910. The cubic root of 28385658 is about 305.0466935588.

The spelling of 28385658 in words is "twenty-eight million, three hundred eighty-five thousand, six hundred fifty-eight".