81418570 has 32 divisors (see below), whose sum is σ = 150564096. Its totient is φ = 31684800.

The previous prime is 81418543. The next prime is 81418607. The reversal of 81418570 is 7581418.

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, 98760 + ... + 99580.

It is an arithmetic number, because the mean of its divisors is an integer number (4705128).

Almost surely, 2^81418570 is an apocalyptic number.

81418570 is a deficient number, since it is larger than the sum of its proper divisors (69145526).

81418570 is a wasteful number, since it uses less digits than its factorization.

81418570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 81418570 is about 9023.2239249616. The cubic root of 81418570 is about 433.4188779175.

Adding to 81418570 its reverse (7581418), we get a palindrome (88999988).

The spelling of 81418570 in words is "eighty-one million, four hundred eighteen thousand, five hundred seventy".