28706177 has 4 divisors (see below), whose sum is σ = 28753620. Its totient is φ = 28658736.

The previous prime is 28706159. The next prime is 28706221. The reversal of 28706177 is 77160782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 817216 + 27888961 = 904^2 + 5281^2 .

It is a cyclic number.

It is not a de Polignac number, because 28706177 - 2⁸ = 28705921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28706177.

It is not an unprimeable number, because it can be changed into a prime (28706107) 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, 22802 + ... + 24027.

It is an arithmetic number, because the mean of its divisors is an integer number (7188405).

Almost surely, 2^28706177 is an apocalyptic number.

It is an amenable number.

28706177 is a deficient number, since it is larger than the sum of its proper divisors (47443).

28706177 is an equidigital number, since it uses as much as digits as its factorization.

28706177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47442.

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 28706177 is about 5357.8145731259. The cubic root of 28706177 is about 306.1905522817.

The spelling of 28706177 in words is "twenty-eight million, seven hundred six thousand, one hundred seventy-seven".