28807180 has 48 divisors (see below), whose sum is σ = 64532160. Its totient is φ = 10764288.

The previous prime is 28807151. The next prime is 28807183. The reversal of 28807180 is 8170882.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (28807183) by changing a digit.

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, 65401 + ... + 65839.

It is an arithmetic number, because the mean of its divisors is an integer number (1344420).

Almost surely, 2^28807180 is an apocalyptic number.

28807180 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 28807180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32266080).

28807180 is an abundant number, since it is smaller than the sum of its proper divisors (35724980).

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

28807180 is a wasteful number, since it uses less digits than its factorization.

28807180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 28807180 is about 5367.2320613143. The cubic root of 28807180 is about 306.5492435341.

The spelling of 28807180 in words is "twenty-eight million, eight hundred seven thousand, one hundred eighty".