28550780 has 12 divisors (see below), whose sum is σ = 59956680. Its totient is φ = 11420304.

The previous prime is 28550779. The next prime is 28550789. The reversal of 28550780 is 8705582.

It is a self number, because there is not a number n which added to its sum of digits gives 28550780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28550789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713750 + ... + 713789.

It is an arithmetic number, because the mean of its divisors is an integer number (4996390).

Almost surely, 2^28550780 is an apocalyptic number.

28550780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28550780 is an abundant number, since it is smaller than the sum of its proper divisors (31405900).

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

28550780 is a wasteful number, since it uses less digits than its factorization.

28550780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427548 (or 1427546 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 28550780 is about 5343.2929921538. The cubic root of 28550780 is about 305.6370452748.

The spelling of 28550780 in words is "twenty-eight million, five hundred fifty thousand, seven hundred eighty".