28682820 has 36 divisors (see below), whose sum is σ = 87005100. Its totient is φ = 7648704.

The previous prime is 28682813. The next prime is 28682867. The reversal of 28682820 is 2828682.

It can be written as a sum of positive squares in 2 ways, for example, as 18455616 + 10227204 = 4296^2 + 3198^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79495 + ... + 79854.

Almost surely, 2^28682820 is an apocalyptic number.

28682820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28682820 is an abundant number, since it is smaller than the sum of its proper divisors (58322280).

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

28682820 is a wasteful number, since it uses less digits than its factorization.

28682820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159364 (or 159359 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 28682820 is about 5355.6344162013. The cubic root of 28682820 is about 306.1074849883.

The spelling of 28682820 in words is "twenty-eight million, six hundred eighty-two thousand, eight hundred twenty".