28959881 has 2 divisors, whose sum is σ = 28959882. Its totient is φ = 28959880.

The previous prime is 28959877. The next prime is 28959907. The reversal of 28959881 is 18895982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28185481 + 774400 = 5309^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 28959881 - 2² = 28959877 is a prime.

It is a super-2 number, since 2×28959881² = 1677349415068322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28959841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14479940 + 14479941.

It is an arithmetic number, because the mean of its divisors is an integer number (14479941).

Almost surely, 2^28959881 is an apocalyptic number.

It is an amenable number.

28959881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28959881 is an equidigital number, since it uses as much as digits as its factorization.

28959881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 50.

The square root of 28959881 is about 5381.4385623177. The cubic root of 28959881 is about 307.0899410036.

The spelling of 28959881 in words is "twenty-eight million, nine hundred fifty-nine thousand, eight hundred eighty-one".