28678720 has 168 divisors, whose sum is σ = 83393280. Its totient is φ = 9354240.

The previous prime is 28678717. The next prime is 28678739. The reversal of 28678720 is 2787682.

It is a Harshad number since it is a multiple of its sum of digits (40).

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 23 ways as a sum of consecutive naturals, for example, 486051 + ... + 486109.

Almost surely, 2^28678720 is an apocalyptic number.

28678720 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 28678720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41696640).

28678720 is an abundant number, since it is smaller than the sum of its proper divisors (54714560).

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

28678720 is a wasteful number, since it uses less digits than its factorization.

28678720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 28678720 is about 5355.2516280750. The cubic root of 28678720 is about 306.0928990155.

The spelling of 28678720 in words is "twenty-eight million, six hundred seventy-eight thousand, seven hundred twenty".