28640177 has 2 divisors, whose sum is σ = 28640178. Its totient is φ = 28640176.

The previous prime is 28640167. The next prime is 28640191. The reversal of 28640177 is 77104682.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28472896 + 167281 = 5336^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 28640177 - 2²⁰ = 27591601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28640147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14320088 + 14320089.

It is an arithmetic number, because the mean of its divisors is an integer number (14320089).

Almost surely, 2^28640177 is an apocalyptic number.

It is an amenable number.

28640177 is a deficient number, since it is larger than the sum of its proper divisors (1).

28640177 is an equidigital number, since it uses as much as digits as its factorization.

28640177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 28640177 is about 5351.6518010797. The cubic root of 28640177 is about 305.9557121887.

The spelling of 28640177 in words is "twenty-eight million, six hundred forty thousand, one hundred seventy-seven".