28780300 has 36 divisors (see below), whose sum is σ = 62739040. Its totient is φ = 11459520.

The previous prime is 28780289. The next prime is 28780313. The reversal of 28780300 is 308782.

It is a happy 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 11 ways as a sum of consecutive naturals, for example, 27181 + ... + 28219.

Almost surely, 2^28780300 is an apocalyptic number.

28780300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28780300 is an abundant number, since it is smaller than the sum of its proper divisors (33958740).

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

28780300 is a wasteful number, since it uses less digits than its factorization.

28780300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330 (or 1323 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 28780300 is about 5364.7273928877. The cubic root of 28780300 is about 306.4538667573.

The spelling of 28780300 in words is "twenty-eight million, seven hundred eighty thousand, three hundred".