28063940 has 48 divisors (see below), whose sum is σ = 63504000. Its totient is φ = 10378752.

The previous prime is 28063939. The next prime is 28063949. The reversal of 28063940 is 4936082.

It is a junction number, because it is equal to n+sod(n) for n = 28063897 and 28063906.

It is not an unprimeable number, because it can be changed into a prime (28063949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19361 + ... + 20759.

It is an arithmetic number, because the mean of its divisors is an integer number (1323000).

Almost surely, 2^28063940 is an apocalyptic number.

28063940 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 28063940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31752000).

28063940 is an abundant number, since it is smaller than the sum of its proper divisors (35440060).

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

28063940 is a wasteful number, since it uses less digits than its factorization.

28063940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484 (or 1482 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 28063940 is about 5297.5409389640. The cubic root of 28063940 is about 303.8898637277.

The spelling of 28063940 in words is "twenty-eight million, sixty-three thousand, nine hundred forty".