81129702 has 8 divisors (see below), whose sum is σ = 162259416. Its totient is φ = 27043232.

The previous prime is 81129679. The next prime is 81129703. The reversal of 81129702 is 20792118.

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

81129702 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 81129702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81129703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6760803 + ... + 6760814.

It is an arithmetic number, because the mean of its divisors is an integer number (20282427).

Almost surely, 2^81129702 is an apocalyptic number.

81129702 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81129702 is a wasteful number, since it uses less digits than its factorization.

81129702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13521622.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 81129702 is about 9007.2027844387. The cubic root of 81129702 is about 432.9056894839.

The spelling of 81129702 in words is "eighty-one million, one hundred twenty-nine thousand, seven hundred two".