28618020 has 72 divisors (see below), whose sum is σ = 89174904. Its totient is φ = 7423488.

The previous prime is 28618013. The next prime is 28618033. The reversal of 28618020 is 2081682.

28618020 is a `hidden beast` number, since 28 + 618 + 0 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8259876 + 20358144 = 2874^2 + 4512^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4512 + ... + 8808.

Almost surely, 2^28618020 is an apocalyptic number.

28618020 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 28618020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44587452).

28618020 is an abundant number, since it is smaller than the sum of its proper divisors (60556884).

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

28618020 is a wasteful number, since it uses less digits than its factorization.

28618020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4349 (or 4344 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 28618020 is about 5349.5812920265. The cubic root of 28618020 is about 305.8767926388.

The spelling of 28618020 in words is "twenty-eight million, six hundred eighteen thousand, twenty".