28866020 has 48 divisors (see below), whose sum is σ = 63307440. Its totient is φ = 11042304.

The previous prime is 28866011. The next prime is 28866043. The reversal of 28866020 is 2066882.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5207524 + 23658496 = 2282^2 + 4864^2 .

It is a super-2 number, since 2×28866020² = 1666494221280800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90902 + ... + 91218.

It is an arithmetic number, because the mean of its divisors is an integer number (1318905).

Almost surely, 2^28866020 is an apocalyptic number.

28866020 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 28866020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31653720).

28866020 is an abundant number, since it is smaller than the sum of its proper divisors (34441420).

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

28866020 is a wasteful number, since it uses less digits than its factorization.

28866020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 510 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 28866020 is about 5372.7106752551. The cubic root of 28866020 is about 306.7578152708.

The spelling of 28866020 in words is "twenty-eight million, eight hundred sixty-six thousand, twenty".