28381980 has 48 divisors (see below), whose sum is σ = 86696064. Its totient is φ = 6880320.

The previous prime is 28381973. The next prime is 28382017. The reversal of 28381980 is 8918382.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20842 + ... + 22161.

It is an arithmetic number, because the mean of its divisors is an integer number (1806168).

Almost surely, 2^28381980 is an apocalyptic number.

28381980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28381980 is an abundant number, since it is smaller than the sum of its proper divisors (58314084).

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

28381980 is a wasteful number, since it uses less digits than its factorization.

28381980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43026 (or 43024 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 28381980 is about 5327.4740731420. The cubic root of 28381980 is about 305.0335177713.

The spelling of 28381980 in words is "twenty-eight million, three hundred eighty-one thousand, nine hundred eighty".