81536332 has 12 divisors (see below), whose sum is σ = 142997400. Its totient is φ = 40679936.

The previous prime is 81536327. The next prime is 81536339. The reversal of 81536332 is 23363518.

It is a junction number, because it is equal to n+sod(n) for n = 81536294 and 81536303.

It is not an unprimeable number, because it can be changed into a prime (81536339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19957 + ... + 23692.

It is an arithmetic number, because the mean of its divisors is an integer number (11916450).

Almost surely, 2^81536332 is an apocalyptic number.

It is an amenable number.

81536332 is a deficient number, since it is larger than the sum of its proper divisors (61461068).

81536332 is a wasteful number, since it uses less digits than its factorization.

81536332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44120 (or 44118 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 81536332 is about 9029.7470617953. The cubic root of 81536332 is about 433.6277397117.

The spelling of 81536332 in words is "eighty-one million, five hundred thirty-six thousand, three hundred thirty-two".