81303018 has 16 divisors (see below), whose sum is σ = 167851776. Its totient is φ = 26226720.

The previous prime is 81302971. The next prime is 81303029. The reversal of 81303018 is 81030318.

It is a super-2 number, since 2×81303018² = 13220361471816648, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218371 + ... + 218742.

It is an arithmetic number, because the mean of its divisors is an integer number (10490736).

Almost surely, 2^81303018 is an apocalyptic number.

81303018 is an abundant number, since it is smaller than the sum of its proper divisors (86548758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81303018 is a wasteful number, since it uses less digits than its factorization.

81303018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437149.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 81303018 is about 9016.8186185594. The cubic root of 81303018 is about 433.2137399096.

The spelling of 81303018 in words is "eighty-one million, three hundred three thousand, eighteen".