80439440 has 20 divisors (see below), whose sum is σ = 187021884. Its totient is φ = 32175744.

The previous prime is 80439433. The next prime is 80439449. The reversal of 80439440 is 4493408.

It can be written as a sum of positive squares in 2 ways, for example, as 50013184 + 30426256 = 7072^2 + 5516^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 80439397 and 80439406.

It is not an unprimeable number, because it can be changed into a prime (80439449) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 502667 + ... + 502826.

Almost surely, 2^80439440 is an apocalyptic number.

80439440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

80439440 is an abundant number, since it is smaller than the sum of its proper divisors (106582444).

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

80439440 is a wasteful number, since it uses less digits than its factorization.

80439440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005506 (or 1005500 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 80439440 is about 8968.8037106406. The cubic root of 80439440 is about 431.6744518074.

The spelling of 80439440 in words is "eighty million, four hundred thirty-nine thousand, four hundred forty".