28068981 has 16 divisors (see below), whose sum is σ = 39536640. Its totient is φ = 17685360.

The previous prime is 28068979. The next prime is 28068983. The reversal of 28068981 is 18986082.

It is an interprime number because it is at equal distance from previous prime (28068979) and next prime (28068983).

It is not a de Polignac number, because 28068981 - 2¹ = 28068979 is a prime.

It is a super-2 number, since 2×28068981² = 1575735388756722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28068983) 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 in 15 ways as a sum of consecutive naturals, for example, 490 + ... + 7508.

It is an arithmetic number, because the mean of its divisors is an integer number (2471040).

Almost surely, 2^28068981 is an apocalyptic number.

It is an amenable number.

28068981 is a deficient number, since it is larger than the sum of its proper divisors (11467659).

28068981 is a wasteful number, since it uses less digits than its factorization.

28068981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7096.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 28068981 is about 5298.0167043904. The cubic root of 28068981 is about 303.9080580973.

The spelling of 28068981 in words is "twenty-eight million, sixty-eight thousand, nine hundred eighty-one".