28001064 has 64 divisors (see below), whose sum is σ = 86163840. Its totient is φ = 7384320.

The previous prime is 28001063. The next prime is 28001069. The reversal of 28001064 is 46010082.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 28001064.

It is not an unprimeable number, because it can be changed into a prime (28001063) by changing a digit.

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, 4227 + ... + 8594.

It is an arithmetic number, because the mean of its divisors is an integer number (1346310).

Almost surely, 2^28001064 is an apocalyptic number.

28001064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28001064 is an abundant number, since it is smaller than the sum of its proper divisors (58162776).

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

28001064 is a wasteful number, since it uses less digits than its factorization.

28001064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12850 (or 12846 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 28001064 is about 5291.6031597239. The cubic root of 28001064 is about 303.6627434849.

The spelling of 28001064 in words is "twenty-eight million, one thousand, sixty-four".