28776988 has 12 divisors (see below), whose sum is σ = 53322192. Its totient is φ = 13542080.

The previous prime is 28776977. The next prime is 28776997. The reversal of 28776988 is 88967782.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 211528 + ... + 211663.

It is an arithmetic number, because the mean of its divisors is an integer number (4443516).

Almost surely, 2^28776988 is an apocalyptic number.

It is an amenable number.

28776988 is a deficient number, since it is larger than the sum of its proper divisors (24545204).

28776988 is a wasteful number, since it uses less digits than its factorization.

28776988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423212 (or 423210 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 55.

The square root of 28776988 is about 5364.4187010337. The cubic root of 28776988 is about 306.4421108671.

The spelling of 28776988 in words is "twenty-eight million, seven hundred seventy-six thousand, nine hundred eighty-eight".