81030178 has 8 divisors (see below), whose sum is σ = 121670172. Its totient is φ = 40473456.

The previous prime is 81030151. The next prime is 81030199. The reversal of 81030178 is 87103018.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78801129 + 2229049 = 8877^2 + 1493^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18325 + ... + 22312.

Almost surely, 2^81030178 is an apocalyptic number.

81030178 is a deficient number, since it is larger than the sum of its proper divisors (40639994).

81030178 is a wasteful number, since it uses less digits than its factorization.

81030178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41636.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 81030178 is about 9001.6763994269. The cubic root of 81030178 is about 432.7285980100.

The spelling of 81030178 in words is "eighty-one million, thirty thousand, one hundred seventy-eight".