28440006 has 64 divisors (see below), whose sum is σ = 69120000. Its totient is φ = 7625376.

The previous prime is 28440001. The next prime is 28440007. The reversal of 28440006 is 60004482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28440001) 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, 56745 + ... + 57243.

It is an arithmetic number, because the mean of its divisors is an integer number (1080000).

Almost surely, 2^28440006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28440006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34560000).

28440006 is an abundant number, since it is smaller than the sum of its proper divisors (40679994).

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

28440006 is a wasteful number, since it uses less digits than its factorization.

28440006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593.

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

The square root of 28440006 is about 5332.9172129333. The cubic root of 28440006 is about 305.2412531761.

Adding to 28440006 its reverse (60004482), we get a palindrome (88444488).

The spelling of 28440006 in words is "twenty-eight million, four hundred forty thousand, six".