28669320 has 96 divisors (see below), whose sum is σ = 94250520. Its totient is φ = 7557120.

The previous prime is 28669297. The next prime is 28669331. The reversal of 28669320 is 2396682.

It can be written as a sum of positive squares in 4 ways, for example, as 19342404 + 9326916 = 4398^2 + 3054^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34510 + ... + 35330.

Almost surely, 2^28669320 is an apocalyptic number.

28669320 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 28669320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47125260).

28669320 is an abundant number, since it is smaller than the sum of its proper divisors (65581200).

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

28669320 is a wasteful number, since it uses less digits than its factorization.

28669320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935 (or 928 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 28669320 is about 5354.3739129799. The cubic root of 28669320 is about 306.0594527568.

The spelling of 28669320 in words is "twenty-eight million, six hundred sixty-nine thousand, three hundred twenty".