81226832 has 10 divisors (see below), whose sum is σ = 157377018. Its totient is φ = 40613408.

The previous prime is 81226811. The next prime is 81226837. The reversal of 81226832 is 23862218.

It can be written as a sum of positive squares in only one way, i.e., 46840336 + 34386496 = 6844^2 + 5864^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81226837) 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, 2538323 + ... + 2538354.

Almost surely, 2^81226832 is an apocalyptic number.

It is an amenable number.

81226832 is a deficient number, since it is larger than the sum of its proper divisors (76150186).

81226832 is a wasteful number, since it uses less digits than its factorization.

81226832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5076685 (or 5076679 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 81226832 is about 9012.5929676204. The cubic root of 81226832 is about 433.0783815209.

The spelling of 81226832 in words is "eighty-one million, two hundred twenty-six thousand, eight hundred thirty-two".