28981860 has 24 divisors (see below), whose sum is σ = 81149376. Its totient is φ = 7728480.

The previous prime is 28981853. The next prime is 28981867. The reversal of 28981860 is 6818982.

It is an interprime number because it is at equal distance from previous prime (28981853) and next prime (28981867).

It is not an unprimeable number, because it can be changed into a prime (28981867) 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 7 ways as a sum of consecutive naturals, for example, 241456 + ... + 241575.

It is an arithmetic number, because the mean of its divisors is an integer number (3381224).

Almost surely, 2^28981860 is an apocalyptic number.

28981860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28981860 is an abundant number, since it is smaller than the sum of its proper divisors (52167516).

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

28981860 is a wasteful number, since it uses less digits than its factorization.

28981860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483043 (or 483041 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 28981860 is about 5383.4802869519. The cubic root of 28981860 is about 307.1676096356.

The spelling of 28981860 in words is "twenty-eight million, nine hundred eighty-one thousand, eight hundred sixty".