28040064 has 128 divisors (see below), whose sum is σ = 82766880. Its totient is φ = 8355840.

The previous prime is 28040057. The next prime is 28040069. The reversal of 28040064 is 46004082.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28040069) 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 15 ways as a sum of consecutive naturals, for example, 204604 + ... + 204740.

Almost surely, 2^28040064 is an apocalyptic number.

28040064 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 28040064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41383440).

28040064 is an abundant number, since it is smaller than the sum of its proper divisors (54726816).

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

28040064 is a wasteful number, since it uses less digits than its factorization.

28040064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 28040064 is about 5295.2869610626. The cubic root of 28040064 is about 303.8036589990.

The spelling of 28040064 in words is "twenty-eight million, forty thousand, sixty-four".