81359032 has 8 divisors (see below), whose sum is σ = 152548200. Its totient is φ = 40679512.

The previous prime is 81359009. The next prime is 81359039. The reversal of 81359032 is 23095318.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 81358985 and 81359003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81359039) by changing a digit.

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 as a sum of consecutive naturals, namely, 5084932 + ... + 5084947.

It is an arithmetic number, because the mean of its divisors is an integer number (19068525).

Almost surely, 2^81359032 is an apocalyptic number.

It is an amenable number.

81359032 is a deficient number, since it is larger than the sum of its proper divisors (71189168).

81359032 is a wasteful number, since it uses less digits than its factorization.

81359032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10169885 (or 10169881 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 81359032 is about 9019.9241681957. The cubic root of 81359032 is about 433.3132051137.

The spelling of 81359032 in words is "eighty-one million, three hundred fifty-nine thousand, thirty-two".