28064388 has 48 divisors (see below), whose sum is σ = 72140544. Its totient is φ = 8420640.

The previous prime is 28064359. The next prime is 28064411. The reversal of 28064388 is 88346082.

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 15 ways as a sum of consecutive naturals, for example, 13131 + ... + 15117.

It is an arithmetic number, because the mean of its divisors is an integer number (1502928).

Almost surely, 2^28064388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28064388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36070272).

28064388 is an abundant number, since it is smaller than the sum of its proper divisors (44076156).

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

28064388 is a wasteful number, since it uses less digits than its factorization.

28064388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112 (or 2110 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 28064388 is about 5297.5832225648. The cubic root of 28064388 is about 303.8914807724.

The spelling of 28064388 in words is "twenty-eight million, sixty-four thousand, three hundred eighty-eight".