80120736 has 144 divisors (see below), whose sum is σ = 241473960. Its totient is φ = 25159680.

The previous prime is 80120723. The next prime is 80120741. The reversal of 80120736 is 63702108.

It can be written as a sum of positive squares in 4 ways, for example, as 54110736 + 26010000 = 7356^2 + 5100^2 .

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

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, 442566 + ... + 442746.

Almost surely, 2^80120736 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 80120736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120736980).

80120736 is an abundant number, since it is smaller than the sum of its proper divisors (161353224).

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

80120736 is a wasteful number, since it uses less digits than its factorization.

80120736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 80120736 is about 8951.0187129734. The cubic root of 80120736 is about 431.1035939062.

The spelling of 80120736 in words is "eighty million, one hundred twenty thousand, seven hundred thirty-six".