28775977 has 2 divisors, whose sum is σ = 28775978. Its totient is φ = 28775976.

The previous prime is 28775953. The next prime is 28775993. The reversal of 28775977 is 77957782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28772496 + 3481 = 5364^2 + 59^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28775977 is a prime.

It is not a weakly prime, because it can be changed into another prime (28775927) 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 as a sum of consecutive naturals, namely, 14387988 + 14387989.

It is an arithmetic number, because the mean of its divisors is an integer number (14387989).

Almost surely, 2^28775977 is an apocalyptic number.

It is an amenable number.

28775977 is a deficient number, since it is larger than the sum of its proper divisors (1).

28775977 is an equidigital number, since it uses as much as digits as its factorization.

28775977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728720, while the sum is 52.

The square root of 28775977 is about 5364.3244681880. The cubic root of 28775977 is about 306.4385221593.

The spelling of 28775977 in words is "twenty-eight million, seven hundred seventy-five thousand, nine hundred seventy-seven".