28001177 has 4 divisors (see below), whose sum is σ = 28134096. Its totient is φ = 27868260.

The previous prime is 28001167. The next prime is 28001179. The reversal of 28001177 is 77110082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28001177 - 2⁴ = 28001161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28001179) 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 3 ways as a sum of consecutive naturals, for example, 66143 + ... + 66564.

It is an arithmetic number, because the mean of its divisors is an integer number (7033524).

Almost surely, 2^28001177 is an apocalyptic number.

It is an amenable number.

28001177 is a deficient number, since it is larger than the sum of its proper divisors (132919).

28001177 is a wasteful number, since it uses less digits than its factorization.

28001177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132918.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 28001177 is about 5291.6138370066. The cubic root of 28001177 is about 303.6631519675.

The spelling of 28001177 in words is "twenty-eight million, one thousand, one hundred seventy-seven".