81410564 has 12 divisors (see below), whose sum is σ = 142606044. Its totient is φ = 40665984.

The previous prime is 81410531. The next prime is 81410587. The reversal of 81410564 is 46501418.

It can be written as a sum of positive squares in 2 ways, for example, as 13017664 + 68392900 = 3608^2 + 8270^2 .

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, 4889 + ... + 13664.

It is an arithmetic number, because the mean of its divisors is an integer number (11883837).

Almost surely, 2^81410564 is an apocalyptic number.

It is an amenable number.

81410564 is a deficient number, since it is larger than the sum of its proper divisors (61195480).

81410564 is a wasteful number, since it uses less digits than its factorization.

81410564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19654 (or 19652 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 81410564 is about 9022.7802810442. The cubic root of 81410564 is about 433.4046712270.

The spelling of 81410564 in words is "eighty-one million, four hundred ten thousand, five hundred sixty-four".