81473456 has 40 divisors (see below), whose sum is σ = 163810944. Its totient is φ = 39214080.

The previous prime is 81473453. The next prime is 81473473. The reversal of 81473456 is 65437418.

It is not an unprimeable number, because it can be changed into a prime (81473453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137096 + ... + 137688.

Almost surely, 2^81473456 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 81473456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81905472).

81473456 is an abundant number, since it is smaller than the sum of its proper divisors (82337488).

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

81473456 is a wasteful number, since it uses less digits than its factorization.

81473456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909 (or 903 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 81473456 is about 9026.2647867210. The cubic root of 81473456 is about 433.5162483539.

The spelling of 81473456 in words is "eighty-one million, four hundred seventy-three thousand, four hundred fifty-six".