81452406 has 96 divisors (see below), whose sum is σ = 205856640. Its totient is φ = 21337344.

The previous prime is 81452401. The next prime is 81452447. The reversal of 81452406 is 60425418.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81452401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 214725 + ... + 215103.

It is an arithmetic number, because the mean of its divisors is an integer number (2144340).

Almost surely, 2^81452406 is an apocalyptic number.

81452406 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 81452406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102928320).

81452406 is an abundant number, since it is smaller than the sum of its proper divisors (124404234).

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

81452406 is a wasteful number, since it uses less digits than its factorization.

81452406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 81452406 is about 9025.0986698207. The cubic root of 81452406 is about 433.4789098001.

The spelling of 81452406 in words is "eighty-one million, four hundred fifty-two thousand, four hundred six".