81129846 has 16 divisors (see below), whose sum is σ = 185439744. Its totient is φ = 23179944.

The previous prime is 81129833. The next prime is 81129887. The reversal of 81129846 is 64892118.

It is a super-3 number, since 3×81129846³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 965790 + ... + 965873.

It is an arithmetic number, because the mean of its divisors is an integer number (11589984).

Almost surely, 2^81129846 is an apocalyptic number.

81129846 is an abundant number, since it is smaller than the sum of its proper divisors (104309898).

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

81129846 is a wasteful number, since it uses less digits than its factorization.

81129846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931675.

The product of its digits is 27648, while the sum is 39.

The square root of 81129846 is about 9007.2107780378. The cubic root of 81129846 is about 432.9059456103.

The spelling of 81129846 in words is "eighty-one million, one hundred twenty-nine thousand, eight hundred forty-six".