28323680 has 192 divisors, whose sum is σ = 88542720. Its totient is φ = 8363520.

The previous prime is 28323671. The next prime is 28323689. The reversal of 28323680 is 8632382.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28323671) and next prime (28323689).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28323689) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1490711 + ... + 1490729.

It is an arithmetic number, because the mean of its divisors is an integer number (461160).

Almost surely, 2^28323680 is an apocalyptic number.

28323680 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 28323680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44271360).

28323680 is an abundant number, since it is smaller than the sum of its proper divisors (60219040).

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

28323680 is a wasteful number, since it uses less digits than its factorization.

28323680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 44 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28323680 is about 5321.9996242014. Note that the first 3 decimals coincide. The cubic root of 28323680 is about 304.8245160919.

28323680 divided by its sum of digits (32) gives a triangular number (885115 = T₁₃₃₀).

The spelling of 28323680 in words is "twenty-eight million, three hundred twenty-three thousand, six hundred eighty".