81827236 has 6 divisors (see below), whose sum is σ = 143197670. Its totient is φ = 40913616.

The previous prime is 81827231. The next prime is 81827269. The reversal of 81827236 is 63272818.

It can be written as a sum of positive squares in only one way, i.e., 76038400 + 5788836 = 8720^2 + 2406^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81827195 and 81827204.

It is not an unprimeable number, because it can be changed into a prime (81827231) by changing a digit.

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 as a sum of consecutive naturals, namely, 10228401 + ... + 10228408.

Almost surely, 2^81827236 is an apocalyptic number.

It is an amenable number.

81827236 is a deficient number, since it is larger than the sum of its proper divisors (61370434).

81827236 is a wasteful number, since it uses less digits than its factorization.

81827236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20456813 (or 20456811 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 81827236 is about 9045.8408122186. The cubic root of 81827236 is about 434.1428242935.

The spelling of 81827236 in words is "eighty-one million, eight hundred twenty-seven thousand, two hundred thirty-six".