28820550 has 48 divisors (see below), whose sum is σ = 77977152. Its totient is φ = 6986400.

The previous prime is 28820531. The next prime is 28820569. The reversal of 28820550 is 5502882.

It is an interprime number because it is at equal distance from previous prime (28820531) and next prime (28820569).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 7084 + ... + 10383.

It is an arithmetic number, because the mean of its divisors is an integer number (1624524).

Almost surely, 2^28820550 is an apocalyptic number.

28820550 is an abundant number, since it is smaller than the sum of its proper divisors (49156602).

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

28820550 is a wasteful number, since it uses less digits than its factorization.

28820550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17493 (or 17488 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 28820550 is about 5368.4774377844. The cubic root of 28820550 is about 306.5966614518.

The spelling of 28820550 in words is "twenty-eight million, eight hundred twenty thousand, five hundred fifty".