28711936 has 44 divisors (see below), whose sum is σ = 62638200. Its totient is φ = 13045760.

The previous prime is 28711909. The next prime is 28711957. The reversal of 28711936 is 63911782.

It is a tau number, because it is divible by the number of its divisors (44).

It is a junction number, because it is equal to n+sod(n) for n = 28711895 and 28711904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9990 + ... + 12538.

Almost surely, 2^28711936 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 28711936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31319100).

28711936 is an abundant number, since it is smaller than the sum of its proper divisors (33926264).

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

28711936 is a wasteful number, since it uses less digits than its factorization.

28711936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580 (or 2562 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 28711936 is about 5358.3519854522. The cubic root of 28711936 is about 306.2110267773.

The spelling of 28711936 in words is "twenty-eight million, seven hundred eleven thousand, nine hundred thirty-six".