81048320 has 72 divisors (see below), whose sum is σ = 202650336. Its totient is φ = 30998528.

The previous prime is 81048313. The next prime is 81048437. The reversal of 81048320 is 2384018.

It is a self number, because there is not a number n which added to its sum of digits gives 81048320.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28064 + ... + 30816.

It is an arithmetic number, because the mean of its divisors is an integer number (2814588).

Almost surely, 2^81048320 is an apocalyptic number.

81048320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81048320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101325168).

81048320 is an abundant number, since it is smaller than the sum of its proper divisors (121602016).

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

81048320 is a wasteful number, since it uses less digits than its factorization.

81048320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797 (or 2783 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 81048320 is about 9002.6840442170. The cubic root of 81048320 is about 432.7608904086.

It can be divided in two parts, 8 and 1048320, that multiplied together give a triangular number (8386560 = T₄₀₉₅).

The spelling of 81048320 in words is "eighty-one million, forty-eight thousand, three hundred twenty".