81045332 has 24 divisors (see below), whose sum is σ = 144985512. Its totient is φ = 39628800.

The previous prime is 81045323. The next prime is 81045373. The reversal of 81045332 is 23354018.

It can be written as a sum of positive squares in 4 ways, for example, as 512656 + 80532676 = 716^2 + 8974^2 .

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 46232 + ... + 47952.

It is an arithmetic number, because the mean of its divisors is an integer number (6041063).

Almost surely, 2^81045332 is an apocalyptic number.

It is an amenable number.

81045332 is a deficient number, since it is larger than the sum of its proper divisors (63940180).

81045332 is a wasteful number, since it uses less digits than its factorization.

81045332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979 (or 1977 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 81045332 is about 9002.5180921784. The cubic root of 81045332 is about 432.7555721596.

The spelling of 81045332 in words is "eighty-one million, forty-five thousand, three hundred thirty-two".