28673280 has 216 divisors, whose sum is σ = 105225120. Its totient is φ = 7188480.

The previous prime is 28673269. The next prime is 28673311. The reversal of 28673280 is 8237682.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 218815 + ... + 218945.

Almost surely, 2^28673280 is an apocalyptic number.

28673280 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 28673280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52612560).

28673280 is an abundant number, since it is smaller than the sum of its proper divisors (76551840).

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

28673280 is a wasteful number, since it uses less digits than its factorization.

28673280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28673280 is about 5354.7436913451. The cubic root of 28673280 is about 306.0735437739.

The spelling of 28673280 in words is "twenty-eight million, six hundred seventy-three thousand, two hundred eighty".