28017388 has 12 divisors (see below), whose sum is σ = 56034832. Its totient is φ = 12007440.

The previous prime is 28017331. The next prime is 28017401. The reversal of 28017388 is 88371082.

28017388 is an admirable 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 3 ways as a sum of consecutive naturals, for example, 500283 + ... + 500338.

Almost surely, 2^28017388 is an apocalyptic number.

28017388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28017388 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28017388 is a wasteful number, since it uses less digits than its factorization.

28017388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000632 (or 1000630 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 28017388 is about 5293.1453786950. The cubic root of 28017388 is about 303.7217415723.

The spelling of 28017388 in words is "twenty-eight million, seventeen thousand, three hundred eighty-eight".