28530936 has 72 divisors (see below), whose sum is σ = 89898120. Its totient is φ = 8150688.

The previous prime is 28530917. The next prime is 28530937. The reversal of 28530936 is 63903582.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28530936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28530937) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 516 + ... + 7571.

It is an arithmetic number, because the mean of its divisors is an integer number (1248585).

Almost surely, 2^28530936 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 28530936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44949060).

28530936 is an abundant number, since it is smaller than the sum of its proper divisors (61367184).

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

28530936 is a wasteful number, since it uses less digits than its factorization.

28530936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8113 (or 8099 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 28530936 is about 5341.4357620400. The cubic root of 28530936 is about 305.5662186374.

The spelling of 28530936 in words is "twenty-eight million, five hundred thirty thousand, nine hundred thirty-six".