81069832 has 8 divisors (see below), whose sum is σ = 152005950. Its totient is φ = 40534912.

The previous prime is 81069823. The next prime is 81069839. The reversal of 81069832 is 23896018.

It can be written as a sum of positive squares in only one way, i.e., 62631396 + 18438436 = 7914^2 + 4294^2 .

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 = 81069791 and 81069800.

It is not an unprimeable number, because it can be changed into a prime (81069839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5066857 + ... + 5066872.

Almost surely, 2^81069832 is an apocalyptic number.

It is an amenable number.

81069832 is a deficient number, since it is larger than the sum of its proper divisors (70936118).

81069832 is a wasteful number, since it uses less digits than its factorization.

81069832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10133735 (or 10133731 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 81069832 is about 9003.8787197518. The cubic root of 81069832 is about 432.7991750958.

The spelling of 81069832 in words is "eighty-one million, sixty-nine thousand, eight hundred thirty-two".