28058238 has 48 divisors (see below), whose sum is σ = 67909296. Its totient is φ = 8631360.

The previous prime is 28058221. The next prime is 28058249. The reversal of 28058238 is 83285082.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4098 + ... + 8538.

It is an arithmetic number, because the mean of its divisors is an integer number (1414777).

Almost surely, 2^28058238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28058238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33954648).

28058238 is an abundant number, since it is smaller than the sum of its proper divisors (39851058).

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

28058238 is a wasteful number, since it uses less digits than its factorization.

28058238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4471 (or 4459 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 28058238 is about 5297.0027373978. The cubic root of 28058238 is about 303.8692809992.

The spelling of 28058238 in words is "twenty-eight million, fifty-eight thousand, two hundred thirty-eight".