28005936 has 80 divisors (see below), whose sum is σ = 87565824. Its totient is φ = 7529472.

The previous prime is 28005917. The next prime is 28005941. The reversal of 28005936 is 63950082.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28005897 and 28005906.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3261 + ... + 8163.

Almost surely, 2^28005936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28005936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43782912).

28005936 is an abundant number, since it is smaller than the sum of its proper divisors (59559888).

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

28005936 is a wasteful number, since it uses less digits than its factorization.

28005936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4938 (or 4932 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 28005936 is about 5292.0634916826. The cubic root of 28005936 is about 303.6803542334.

The spelling of 28005936 in words is "twenty-eight million, five thousand, nine hundred thirty-six".