28039858 has 72 divisors (see below), whose sum is σ = 57743280. Its totient is φ = 10069920.

The previous prime is 28039853. The next prime is 28039861. The reversal of 28039858 is 85893082.

It is not an unprimeable number, because it can be changed into a prime (28039853) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 757816 + ... + 757852.

It is an arithmetic number, because the mean of its divisors is an integer number (801990).

Almost surely, 2^28039858 is an apocalyptic number.

28039858 is an abundant number, since it is smaller than the sum of its proper divisors (29703422).

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

28039858 is a wasteful number, since it uses less digits than its factorization.

28039858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 28039858 is about 5295.2675097676. The cubic root of 28039858 is about 303.8029150194.

The spelling of 28039858 in words is "twenty-eight million, thirty-nine thousand, eight hundred fifty-eight".