28781167 has 2 divisors, whose sum is σ = 28781168. Its totient is φ = 28781166.

The previous prime is 28781141. The next prime is 28781183. The reversal of 28781167 is 76118782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28781167 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28781567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14390583 + 14390584.

It is an arithmetic number, because the mean of its divisors is an integer number (14390584).

Almost surely, 2^28781167 is an apocalyptic number.

28781167 is a deficient number, since it is larger than the sum of its proper divisors (1).

28781167 is an equidigital number, since it uses as much as digits as its factorization.

28781167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 40.

The square root of 28781167 is about 5364.8081978762. The cubic root of 28781167 is about 306.4569440108.

The spelling of 28781167 in words is "twenty-eight million, seven hundred eighty-one thousand, one hundred sixty-seven".