28390180 has 96 divisors (see below), whose sum is σ = 77333760. Its totient is φ = 8501760.

The previous prime is 28390177. The next prime is 28390207. The reversal of 28390180 is 8109382.

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 31 ways as a sum of consecutive naturals, for example, 34170 + ... + 34990.

It is an arithmetic number, because the mean of its divisors is an integer number (805560).

Almost surely, 2^28390180 is an apocalyptic number.

28390180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28390180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38666880).

28390180 is an abundant number, since it is smaller than the sum of its proper divisors (48943580).

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

28390180 is a wasteful number, since it uses less digits than its factorization.

28390180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 28390180 is about 5328.2436130492. The cubic root of 28390180 is about 305.0628912681.

The spelling of 28390180 in words is "twenty-eight million, three hundred ninety thousand, one hundred eighty".