28064240 has 20 divisors (see below), whose sum is σ = 65249544. Its totient is φ = 11225664.

The previous prime is 28064219. The next prime is 28064249. The reversal of 28064240 is 4246082.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28064249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175322 + ... + 175481.

Almost surely, 2^28064240 is an apocalyptic number.

28064240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28064240 is an abundant number, since it is smaller than the sum of its proper divisors (37185304).

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

28064240 is a wasteful number, since it uses less digits than its factorization.

28064240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350816 (or 350810 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 28064240 is about 5297.5692539126. The cubic root of 28064240 is about 303.8909465720.

The spelling of 28064240 in words is "twenty-eight million, sixty-four thousand, two hundred forty".