28872917 has 2 divisors, whose sum is σ = 28872918. Its totient is φ = 28872916.

The previous prime is 28872869. The next prime is 28872967. The reversal of 28872917 is 71927882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28793956 + 78961 = 5366^2 + 281^2 .

It is a cyclic number.

It is not a de Polignac number, because 28872917 - 2¹⁴ = 28856533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28872967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14436458 + 14436459.

It is an arithmetic number, because the mean of its divisors is an integer number (14436459).

Almost surely, 2^28872917 is an apocalyptic number.

It is an amenable number.

28872917 is a deficient number, since it is larger than the sum of its proper divisors (1).

28872917 is an equidigital number, since it uses as much as digits as its factorization.

28872917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 44.

The square root of 28872917 is about 5373.3524916945. The cubic root of 28872917 is about 306.7822446884.

The spelling of 28872917 in words is "twenty-eight million, eight hundred seventy-two thousand, nine hundred seventeen".