81830518 has 64 divisors (see below), whose sum is σ = 161118720. Its totient is φ = 30240000.

The previous prime is 81830477. The next prime is 81830521. The reversal of 81830518 is 81503818.

It is a super-2 number, since 2×81830518² = 13392467352296648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 325893 + ... + 326143.

It is an arithmetic number, because the mean of its divisors is an integer number (2517480).

Almost surely, 2^81830518 is an apocalyptic number.

81830518 is a deficient number, since it is larger than the sum of its proper divisors (79288202).

81830518 is a wasteful number, since it uses less digits than its factorization.

81830518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 81830518 is about 9046.0222197384. The cubic root of 81830518 is about 434.1486285455.

The spelling of 81830518 in words is "eighty-one million, eight hundred thirty thousand, five hundred eighteen".