28777800 has 48 divisors (see below), whose sum is σ = 89213040. Its totient is φ = 7673920.

The previous prime is 28777783. The next prime is 28777811. The reversal of 28777800 is 877782.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 23382 + ... + 24581.

It is an arithmetic number, because the mean of its divisors is an integer number (1858605).

Almost surely, 2^28777800 is an apocalyptic number.

28777800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28777800 is an abundant number, since it is smaller than the sum of its proper divisors (60435240).

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

28777800 is a wasteful number, since it uses less digits than its factorization.

28777800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47982 (or 47973 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 39.

The square root of 28777800 is about 5364.4943843758. The cubic root of 28777800 is about 306.4449931314. Note that the first 3 decimals are identical.

It can be divided in two parts, 287 and 77800, that added together give a palindrome (78087).

The spelling of 28777800 in words is "twenty-eight million, seven hundred seventy-seven thousand, eight hundred".