81070732 has 12 divisors (see below), whose sum is σ = 142026696. Its totient is φ = 40491680.

The previous prime is 81070729. The next prime is 81070783. The reversal of 81070732 is 23707018.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81070732.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6553 + ... + 14320.

It is an arithmetic number, because the mean of its divisors is an integer number (11835558).

Almost surely, 2^81070732 is an apocalyptic number.

It is an amenable number.

81070732 is a deficient number, since it is larger than the sum of its proper divisors (60955964).

81070732 is a wasteful number, since it uses less digits than its factorization.

81070732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21848 (or 21846 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 81070732 is about 9003.9286980740. The cubic root of 81070732 is about 432.8007766690.

The spelling of 81070732 in words is "eighty-one million, seventy thousand, seven hundred thirty-two".