28896660 has 144 divisors (see below), whose sum is σ = 96589584. Its totient is φ = 6948864.

The previous prime is 28896653. The next prime is 28896689. The reversal of 28896660 is 6669882.

It can be written as a sum of positive squares in 8 ways, for example, as 2702736 + 26193924 = 1644^2 + 5118^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 123904 + ... + 124136.

It is an arithmetic number, because the mean of its divisors is an integer number (670761).

Almost surely, 2^28896660 is an apocalyptic number.

28896660 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 28896660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48294792).

28896660 is an abundant number, since it is smaller than the sum of its proper divisors (67692924).

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

28896660 is a wasteful number, since it uses less digits than its factorization.

28896660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 28896660 is about 5375.5613660342. The cubic root of 28896660 is about 306.8663134965.

The spelling of 28896660 in words is "twenty-eight million, eight hundred ninety-six thousand, six hundred sixty".