28805504 has 64 divisors (see below), whose sum is σ = 70657440. Its totient is φ = 11390976.

The previous prime is 28805489. The next prime is 28805519. The reversal of 28805504 is 40550882.

It is an interprime number because it is at equal distance from previous prime (28805489) and next prime (28805519).

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10412 + ... + 12884.

Almost surely, 2^28805504 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 28805504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35328720).

28805504 is an abundant number, since it is smaller than the sum of its proper divisors (41851936).

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

28805504 is a wasteful number, since it uses less digits than its factorization.

28805504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2507 (or 2495 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 28805504 is about 5367.0759264240. The cubic root of 28805504 is about 306.5432984132.

The spelling of 28805504 in words is "twenty-eight million, eight hundred five thousand, five hundred four".