80561376 has 144 divisors (see below), whose sum is σ = 265356000. Its totient is φ = 22708224.

The previous prime is 80561339. The next prime is 80561389. The reversal of 80561376 is 67316508.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a self number, because there is not a number n which added to its sum of digits gives 80561376.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 179200 + ... + 179648.

It is an arithmetic number, because the mean of its divisors is an integer number (1842750).

Almost surely, 2^80561376 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 80561376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132678000).

80561376 is an abundant number, since it is smaller than the sum of its proper divisors (184794624).

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

80561376 is a wasteful number, since it uses less digits than its factorization.

80561376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 80561376 is about 8975.5989215205. The cubic root of 80561376 is about 431.8924629451.

The spelling of 80561376 in words is "eighty million, five hundred sixty-one thousand, three hundred seventy-six".