28023858 has 12 divisors (see below), whose sum is σ = 60718398. Its totient is φ = 9341280.

The previous prime is 28023857. The next prime is 28023923. The reversal of 28023858 is 85832082.

It can be written as a sum of positive squares in only one way, i.e., 20223009 + 7800849 = 4497^2 + 2793^2 .

It is not an unprimeable number, because it can be changed into a prime (28023851) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 778423 + ... + 778458.

Almost surely, 2^28023858 is an apocalyptic number.

28023858 is an abundant number, since it is smaller than the sum of its proper divisors (32694540).

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

28023858 is a wasteful number, since it uses less digits than its factorization.

28023858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556889 (or 1556886 counting only the distinct ones).

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

The square root of 28023858 is about 5293.7565112121. The cubic root of 28023858 is about 303.7451190599.

The spelling of 28023858 in words is "twenty-eight million, twenty-three thousand, eight hundred fifty-eight".