28520064 has 96 divisors (see below), whose sum is σ = 86455200. Its totient is φ = 8999424.

The previous prime is 28520059. The next prime is 28520099. The reversal of 28520064 is 46002582.

It is a tau number, because it is divible by the number of its divisors (96).

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 11 ways as a sum of consecutive naturals, for example, 21237 + ... + 22539.

It is an arithmetic number, because the mean of its divisors is an integer number (900575).

Almost surely, 2^28520064 is an apocalyptic number.

28520064 is a gapful number since it is divisible by the number (24) 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 28520064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43227600).

28520064 is an abundant number, since it is smaller than the sum of its proper divisors (57935136).

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

28520064 is a wasteful number, since it uses less digits than its factorization.

28520064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342 (or 1327 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28520064 is about 5340.4179611712. The cubic root of 28520064 is about 305.5274006798.

The spelling of 28520064 in words is "twenty-eight million, five hundred twenty thousand, sixty-four".