28728177 has 4 divisors (see below), whose sum is σ = 38304240. Its totient is φ = 19152116.

The previous prime is 28728163. The next prime is 28728191. The reversal of 28728177 is 77182782.

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 an interprime number because it is at equal distance from previous prime (28728163) and next prime (28728191).

It is a cyclic number.

It is not a de Polignac number, because 28728177 - 2¹¹ = 28726129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28728157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4788027 + ... + 4788032.

It is an arithmetic number, because the mean of its divisors is an integer number (9576060).

Almost surely, 2^28728177 is an apocalyptic number.

It is an amenable number.

28728177 is a deficient number, since it is larger than the sum of its proper divisors (9576063).

28728177 is an equidigital number, since it uses as much as digits as its factorization.

28728177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9576062.

The product of its digits is 87808, while the sum is 42.

The square root of 28728177 is about 5359.8672558189. The cubic root of 28728177 is about 306.2687523156.

The spelling of 28728177 in words is "twenty-eight million, seven hundred twenty-eight thousand, one hundred seventy-seven".