81704448 has 240 divisors, whose sum is σ = 287258400. Its totient is φ = 21823488.

The previous prime is 81704401. The next prime is 81704449. The reversal of 81704448 is 84440718.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81704449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 548278 + ... + 548426.

It is an arithmetic number, because the mean of its divisors is an integer number (1196910).

Almost surely, 2^81704448 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 81704448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143629200).

81704448 is an abundant number, since it is smaller than the sum of its proper divisors (205553952).

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

81704448 is a wasteful number, since it uses less digits than its factorization.

81704448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 81704448 is about 9039.0512776508. The cubic root of 81704448 is about 433.9255607923.

The spelling of 81704448 in words is "eighty-one million, seven hundred four thousand, four hundred forty-eight".