81436604 has 12 divisors (see below), whose sum is σ = 142652328. Its totient is φ = 40678800.

The previous prime is 81436573. The next prime is 81436609. The reversal of 81436604 is 40663418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81436609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4967 + ... + 13694.

It is an arithmetic number, because the mean of its divisors is an integer number (11887694).

Almost surely, 2^81436604 is an apocalyptic number.

It is an amenable number.

81436604 is a deficient number, since it is larger than the sum of its proper divisors (61215724).

81436604 is a wasteful number, since it uses less digits than its factorization.

81436604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19756 (or 19754 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 81436604 is about 9024.2231798643. The cubic root of 81436604 is about 433.4508759372.

The spelling of 81436604 in words is "eighty-one million, four hundred thirty-six thousand, six hundred four".