28869817 has 2 divisors, whose sum is σ = 28869818. Its totient is φ = 28869816.

The previous prime is 28869751. The next prime is 28869833. The reversal of 28869817 is 71896882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28259856 + 609961 = 5316^2 + 781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28869817 is a prime.

It is a super-2 number, since 2×28869817² = 1666932667226978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28869857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14434908 + 14434909.

It is an arithmetic number, because the mean of its divisors is an integer number (14434909).

Almost surely, 2^28869817 is an apocalyptic number.

It is an amenable number.

28869817 is a deficient number, since it is larger than the sum of its proper divisors (1).

28869817 is an equidigital number, since it uses as much as digits as its factorization.

28869817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 49.

The square root of 28869817 is about 5373.0640234414. The cubic root of 28869817 is about 306.7712648603.

The spelling of 28869817 in words is "twenty-eight million, eight hundred sixty-nine thousand, eight hundred seventeen".