28073340 has 72 divisors (see below), whose sum is σ = 88871328. Its totient is φ = 7159680.

The previous prime is 28073299. The next prime is 28073369. The reversal of 28073340 is 4337082.

It is a super-2 number, since 2×28073340² = 1576224837511200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 750 + ... + 7530.

It is an arithmetic number, because the mean of its divisors is an integer number (1234324).

Almost surely, 2^28073340 is an apocalyptic number.

28073340 is a gapful number since it is divisible by the number (20) 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 28073340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44435664).

28073340 is an abundant number, since it is smaller than the sum of its proper divisors (60797988).

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

28073340 is a wasteful number, since it uses less digits than its factorization.

28073340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6819 (or 6814 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 28073340 is about 5298.4280687766. The cubic root of 28073340 is about 303.9237891832.

The spelling of 28073340 in words is "twenty-eight million, seventy-three thousand, three hundred forty".