81069635 has 8 divisors (see below), whose sum is σ = 97928736. Its totient is φ = 64425600.

The previous prime is 81069631. The next prime is 81069647. The reversal of 81069635 is 53696018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81069635 - 2² = 81069631 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81069631) 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 in 7 ways as a sum of consecutive naturals, for example, 52934 + ... + 54443.

It is an arithmetic number, because the mean of its divisors is an integer number (12241092).

Almost surely, 2^81069635 is an apocalyptic number.

81069635 is a deficient number, since it is larger than the sum of its proper divisors (16859101).

81069635 is a wasteful number, since it uses less digits than its factorization.

81069635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107533.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 81069635 is about 9003.8677800154. The cubic root of 81069635 is about 432.7988245276.

The spelling of 81069635 in words is "eighty-one million, sixty-nine thousand, six hundred thirty-five".