28280550 has 48 divisors (see below), whose sum is σ = 73834560. Its totient is φ = 7143840.

The previous prime is 28280491. The next prime is 28280563. The reversal of 28280550 is 5508282.

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2112 + ... + 7811.

It is an arithmetic number, because the mean of its divisors is an integer number (1538220).

Almost surely, 2^28280550 is an apocalyptic number.

28280550 is an abundant number, since it is smaller than the sum of its proper divisors (45554010).

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

28280550 is a wasteful number, since it uses less digits than its factorization.

28280550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9957 (or 9952 counting only the distinct ones).

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

The square root of 28280550 is about 5317.9460320691. The cubic root of 28280550 is about 304.6697132286.

The spelling of 28280550 in words is "twenty-eight million, two hundred eighty thousand, five hundred fifty".