81468073 has 4 divisors (see below), whose sum is σ = 82584148. Its totient is φ = 80352000.

The previous prime is 81468053. The next prime is 81468077. The reversal of 81468073 is 37086418.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38787984 + 42680089 = 6228^2 + 6533^2 .

It is a cyclic number.

It is not a de Polignac number, because 81468073 - 2¹⁷ = 81337001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81468077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557928 + ... + 558073.

It is an arithmetic number, because the mean of its divisors is an integer number (20646037).

Almost surely, 2^81468073 is an apocalyptic number.

It is an amenable number.

81468073 is a deficient number, since it is larger than the sum of its proper divisors (1116075).

81468073 is a wasteful number, since it uses less digits than its factorization.

81468073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116074.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 81468073 is about 9025.9665964372. The cubic root of 81468073 is about 433.5067005843.

The spelling of 81468073 in words is "eighty-one million, four hundred sixty-eight thousand, seventy-three".