28361780 has 24 divisors (see below), whose sum is σ = 63064008. Its totient is φ = 10677248.

The previous prime is 28361717. The next prime is 28361819. The reversal of 28361780 is 8716382.

It can be written as a sum of positive squares in 4 ways, for example, as 1196836 + 27164944 = 1094^2 + 5212^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28361780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41369 + ... + 42048.

It is an arithmetic number, because the mean of its divisors is an integer number (2627667).

Almost surely, 2^28361780 is an apocalyptic number.

28361780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28361780 is an abundant number, since it is smaller than the sum of its proper divisors (34702228).

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

28361780 is a wasteful number, since it uses less digits than its factorization.

28361780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83443 (or 83441 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28361780 is about 5325.5779029134. The cubic root of 28361780 is about 304.9611345263.

The spelling of 28361780 in words is "twenty-eight million, three hundred sixty-one thousand, seven hundred eighty".