28927780 has 24 divisors (see below), whose sum is σ = 69427008. Its totient is φ = 9918048.

The previous prime is 28927757. The next prime is 28927781. The reversal of 28927780 is 8772982.

It is not an unprimeable number, because it can be changed into a prime (28927781) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 103174 + ... + 103453.

It is an arithmetic number, because the mean of its divisors is an integer number (2892792).

Almost surely, 2^28927780 is an apocalyptic number.

28927780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28927780 is an abundant number, since it is smaller than the sum of its proper divisors (40499228).

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

28927780 is a wasteful number, since it uses less digits than its factorization.

28927780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206643 (or 206641 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 28927780 is about 5378.4551685405. The cubic root of 28927780 is about 306.9764329541.

The spelling of 28927780 in words is "twenty-eight million, nine hundred twenty-seven thousand, seven hundred eighty".