28006344 has 128 divisors (see below), whose sum is σ = 85536000. Its totient is φ = 8451072.

The previous prime is 28006343. The next prime is 28006409. The reversal of 28006344 is 44360082.

28006344 is a `hidden beast` number, since 28 + 0 + 0 + 634 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28006343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106357 + ... + 106619.

It is an arithmetic number, because the mean of its divisors is an integer number (668250).

Almost surely, 2^28006344 is an apocalyptic number.

28006344 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 28006344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42768000).

28006344 is an abundant number, since it is smaller than the sum of its proper divisors (57529656).

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

28006344 is a wasteful number, since it uses less digits than its factorization.

28006344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 28006344 is about 5292.1020398326. The cubic root of 28006344 is about 303.6818289325.

The spelling of 28006344 in words is "twenty-eight million, six thousand, three hundred forty-four".