81783835 has 16 divisors (see below), whose sum is σ = 113743872. Its totient is φ = 55288800.

The previous prime is 81783833. The next prime is 81783839. The reversal of 81783835 is 53838718.

It is not a de Polignac number, because 81783835 - 2¹ = 81783833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81783791 and 81783800.

It is not an unprimeable number, because it can be changed into a prime (81783833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13971 + ... + 18940.

It is an arithmetic number, because the mean of its divisors is an integer number (7108992).

Almost surely, 2^81783835 is an apocalyptic number.

81783835 is a deficient number, since it is larger than the sum of its proper divisors (31960037).

81783835 is a wasteful number, since it uses less digits than its factorization.

81783835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32994.

The product of its digits is 161280, while the sum is 43.

The square root of 81783835 is about 9043.4415462256. The cubic root of 81783835 is about 434.0660545613.

The spelling of 81783835 in words is "eighty-one million, seven hundred eighty-three thousand, eight hundred thirty-five".