80661120 has 128 divisors (see below), whose sum is σ = 263355840. Its totient is φ = 20987904.

The previous prime is 80661089. The next prime is 80661157. The reversal of 80661120 is 2116608.

It is a tau number, because it is divible by the number of its divisors (128).

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

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 15 ways as a sum of consecutive naturals, for example, 82072 + ... + 83048.

Almost surely, 2^80661120 is an apocalyptic number.

80661120 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 80661120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131677920).

80661120 is an abundant number, since it is smaller than the sum of its proper divisors (182694720).

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

80661120 is a wasteful number, since it uses less digits than its factorization.

80661120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042 (or 1030 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 80661120 is about 8981.1536007353. The cubic root of 80661120 is about 432.0706331694.

Adding to 80661120 its reverse (2116608), we get a palindrome (82777728).

The spelling of 80661120 in words is "eighty million, six hundred sixty-one thousand, one hundred twenty".