81118028 has 6 divisors (see below), whose sum is σ = 141956556. Its totient is φ = 40559012.

The previous prime is 81118013. The next prime is 81118043. The reversal of 81118028 is 82081118.

It is an interprime number because it is at equal distance from previous prime (81118013) and next prime (81118043).

It is an unprimeable number.

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, 10139750 + ... + 10139757.

It is an arithmetic number, because the mean of its divisors is an integer number (23659426).

Almost surely, 2^81118028 is an apocalyptic number.

It is an amenable number.

81118028 is a deficient number, since it is larger than the sum of its proper divisors (60838528).

81118028 is a wasteful number, since it uses less digits than its factorization.

81118028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20279511 (or 20279509 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 29.

The square root of 81118028 is about 9006.5547241995. The cubic root of 81118028 is about 432.8849244483.

The spelling of 81118028 in words is "eighty-one million, one hundred eighteen thousand, twenty-eight".