28543680 has 336 divisors, whose sum is σ = 115543584. Its totient is φ = 6389760.

The previous prime is 28543679. The next prime is 28543693. The reversal of 28543680 is 8634582.

28543680 = T₁₈₂₄ + T₁₈₂₅ + ... + T₁₈₄₀.

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 (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 538534 + ... + 538586.

Almost surely, 2^28543680 is an apocalyptic number.

28543680 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 28543680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57771792).

28543680 is an abundant number, since it is smaller than the sum of its proper divisors (86999904).

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

28543680 is a wasteful number, since it uses less digits than its factorization.

28543680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 28543680 is about 5342.6285665391. The cubic root of 28543680 is about 305.6117079293.

The spelling of 28543680 in words is "twenty-eight million, five hundred forty-three thousand, six hundred eighty".