28064880 has 200 divisors, whose sum is σ = 100466784. Its totient is φ = 7257600.

The previous prime is 28064879. The next prime is 28064891. The reversal of 28064880 is 8846082.

28064880 is a `hidden beast` number, since 2 + 8 + 0 + 648 + 8 + 0 = 666.

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 39 ways as a sum of consecutive naturals, for example, 395245 + ... + 395315.

Almost surely, 2^28064880 is an apocalyptic number.

28064880 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 28064880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50233392).

28064880 is an abundant number, since it is smaller than the sum of its proper divisors (72401904).

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

28064880 is a wasteful number, since it uses less digits than its factorization.

28064880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 28064880 is about 5297.6296586304. The cubic root of 28064880 is about 303.8932566141.

The spelling of 28064880 in words is "twenty-eight million, sixty-four thousand, eight hundred eighty".