81436132 has 24 divisors (see below), whose sum is σ = 147474432. Its totient is φ = 39307200.

The previous prime is 81436087. The next prime is 81436133. The reversal of 81436132 is 23163418.

It is a self number, because there is not a number n which added to its sum of digits gives 81436132.

It is not an unprimeable number, because it can be changed into a prime (81436133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93933 + ... + 94795.

It is an arithmetic number, because the mean of its divisors is an integer number (6144768).

Almost surely, 2^81436132 is an apocalyptic number.

It is an amenable number.

81436132 is a deficient number, since it is larger than the sum of its proper divisors (66038300).

81436132 is a wasteful number, since it uses less digits than its factorization.

81436132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659 (or 1657 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 81436132 is about 9024.1970279909. The cubic root of 81436132 is about 433.4500385202.

The spelling of 81436132 in words is "eighty-one million, four hundred thirty-six thousand, one hundred thirty-two".