81204448 has 24 divisors (see below), whose sum is σ = 172169928. Its totient is φ = 37478784.

The previous prime is 81204443. The next prime is 81204449. The reversal of 81204448 is 84440218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81204443) 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, 97186 + ... + 98017.

It is an arithmetic number, because the mean of its divisors is an integer number (7173747).

Almost surely, 2^81204448 is an apocalyptic number.

It is an amenable number.

81204448 is an abundant number, since it is smaller than the sum of its proper divisors (90965480).

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

81204448 is a wasteful number, since it uses less digits than its factorization.

81204448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195226 (or 195218 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 81204448 is about 9011.3510640747. The cubic root of 81204448 is about 433.0385961574.

The spelling of 81204448 in words is "eighty-one million, two hundred four thousand, four hundred forty-eight".