28008340 has 12 divisors (see below), whose sum is σ = 58817556. Its totient is φ = 11203328.

The previous prime is 28008317. The next prime is 28008347. The reversal of 28008340 is 4380082.

It can be written as a sum of positive squares in 2 ways, for example, as 18558864 + 9449476 = 4308^2 + 3074^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28008347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700189 + ... + 700228.

It is an arithmetic number, because the mean of its divisors is an integer number (4901463).

Almost surely, 2^28008340 is an apocalyptic number.

28008340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28008340 is an abundant number, since it is smaller than the sum of its proper divisors (30809216).

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

28008340 is a wasteful number, since it uses less digits than its factorization.

28008340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400426 (or 1400424 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 28008340 is about 5292.2906193821. The cubic root of 28008340 is about 303.6890431852.

The spelling of 28008340 in words is "twenty-eight million, eight thousand, three hundred forty".