81434712 has 64 divisors (see below), whose sum is σ = 210509280. Its totient is φ = 26237952.

The previous prime is 81434707. The next prime is 81434713. The reversal of 81434712 is 21743418.

It is a super-2 number, since 2×81434712² = 13263224637045888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81434712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81434713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92418 + ... + 93294.

Almost surely, 2^81434712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81434712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105254640).

81434712 is an abundant number, since it is smaller than the sum of its proper divisors (129074568).

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

81434712 is a wasteful number, since it uses less digits than its factorization.

81434712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012 (or 1008 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 81434712 is about 9024.1183502877. The cubic root of 81434712 is about 433.4475191527.

The spelling of 81434712 in words is "eighty-one million, four hundred thirty-four thousand, seven hundred twelve".