80561040 has 160 divisors (see below), whose sum is σ = 289505280. Its totient is φ = 18150912.

The previous prime is 80561003. The next prime is 80561057. The reversal of 80561040 is 4016508.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 80561040.

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 31 ways as a sum of consecutive naturals, for example, 132417 + ... + 133023.

It is an arithmetic number, because the mean of its divisors is an integer number (1809408).

Almost surely, 2^80561040 is an apocalyptic number.

80561040 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 80561040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144752640).

80561040 is an abundant number, since it is smaller than the sum of its proper divisors (208944240).

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

80561040 is a wasteful number, since it uses less digits than its factorization.

80561040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 80561040 is about 8975.5802040871. The cubic root of 80561040 is about 431.8918625082.

Adding to 80561040 its reverse (4016508), we get a palindrome (84577548).

The spelling of 80561040 in words is "eighty million, five hundred sixty-one thousand, forty".