81818070 has 32 divisors (see below), whose sum is σ = 200544768. Its totient is φ = 21353568.

The previous prime is 81818069. The next prime is 81818111. The reversal of 81818070 is 7081818.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 27604 + ... + 30423.

It is an arithmetic number, because the mean of its divisors is an integer number (6267024).

Almost surely, 2^81818070 is an apocalyptic number.

81818070 is an abundant number, since it is smaller than the sum of its proper divisors (118726698).

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

81818070 is a wasteful number, since it uses less digits than its factorization.

81818070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58084.

The product of its (nonzero) digits is 3584, while the sum is 33.

The square root of 81818070 is about 9045.3341563482. The cubic root of 81818070 is about 434.1266133026.

Adding to 81818070 its reverse (7081818), we get a palindrome (88899888).

The spelling of 81818070 in words is "eighty-one million, eight hundred eighteen thousand, seventy".