28646660 has 48 divisors (see below), whose sum is σ = 69718656. Its totient is φ = 9683712.

The previous prime is 28646633. The next prime is 28646671. The reversal of 28646660 is 6664682.

It is a super-2 number, since 2×28646660² = 1641262258311200, which contains 22 as substring.

It is an unprimeable number.

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, 8819 + ... + 11621.

It is an arithmetic number, because the mean of its divisors is an integer number (1452472).

Almost surely, 2^28646660 is an apocalyptic number.

28646660 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 28646660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34859328).

28646660 is an abundant number, since it is smaller than the sum of its proper divisors (41071996).

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

28646660 is a wasteful number, since it uses less digits than its factorization.

28646660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2892 (or 2890 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 28646660 is about 5352.2574676486. The cubic root of 28646660 is about 305.9787958594.

The spelling of 28646660 in words is "twenty-eight million, six hundred forty-six thousand, six hundred sixty".