81479034 has 80 divisors (see below), whose sum is σ = 224746368. Its totient is φ = 21485088.

The previous prime is 81479017. The next prime is 81479039. The reversal of 81479034 is 43097418.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81479034.

It is not an unprimeable number, because it can be changed into a prime (81479039) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11979 + ... + 17505.

Almost surely, 2^81479034 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81479034, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112373184).

81479034 is an abundant number, since it is smaller than the sum of its proper divisors (143267334).

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

81479034 is a wasteful number, since it uses less digits than its factorization.

81479034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561 (or 5552 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 81479034 is about 9026.5737686012. The cubic root of 81479034 is about 433.5261415492.

The spelling of 81479034 in words is "eighty-one million, four hundred seventy-nine thousand, thirty-four".