28576506 has 72 divisors (see below), whose sum is σ = 69291936. Its totient is φ = 7832160.

The previous prime is 28576501. The next prime is 28576531. The reversal of 28576506 is 60567582.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28576501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 402451 + ... + 402521.

It is an arithmetic number, because the mean of its divisors is an integer number (962388).

Almost surely, 2^28576506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28576506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34645968).

28576506 is an abundant number, since it is smaller than the sum of its proper divisors (40715430).

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

28576506 is a wasteful number, since it uses less digits than its factorization.

28576506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 28576506 is about 5345.6997671025. The cubic root of 28576506 is about 305.7288169436.

The spelling of 28576506 in words is "twenty-eight million, five hundred seventy-six thousand, five hundred six".