81448168 has 16 divisors (see below), whose sum is σ = 153742500. Its totient is φ = 40450176.

The previous prime is 81448163. The next prime is 81448219. The reversal of 81448168 is 86184418.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 81036004 + 412164 = 9002^2 + 642^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81448168.

It is not an unprimeable number, because it can be changed into a prime (81448163) 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, 32973 + ... + 35356.

Almost surely, 2^81448168 is an apocalyptic number.

It is an amenable number.

81448168 is a deficient number, since it is larger than the sum of its proper divisors (72294332).

81448168 is a wasteful number, since it uses less digits than its factorization.

81448168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68484 (or 68480 counting only the distinct ones).

The product of its digits is 49152, while the sum is 40.

The square root of 81448168 is about 9024.8638770898. The cubic root of 81448168 is about 433.4713916449.

The spelling of 81448168 in words is "eighty-one million, four hundred forty-eight thousand, one hundred sixty-eight".