81069294 has 32 divisors (see below), whose sum is σ = 176324256. Its totient is φ = 24744960.

The previous prime is 81069293. The next prime is 81069323. The reversal of 81069294 is 49296018.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81069293) 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 in 15 ways as a sum of consecutive naturals, for example, 6967 + ... + 14514.

It is an arithmetic number, because the mean of its divisors is an integer number (5510133).

Almost surely, 2^81069294 is an apocalyptic number.

81069294 is an abundant number, since it is smaller than the sum of its proper divisors (95254962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81069294 is a wasteful number, since it uses less digits than its factorization.

81069294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21540.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 81069294 is about 9003.8488436890. The cubic root of 81069294 is about 432.7982177052.

The spelling of 81069294 in words is "eighty-one million, sixty-nine thousand, two hundred ninety-four".