80871440 has 40 divisors (see below), whose sum is σ = 202492248. Its totient is φ = 29859840.

The previous prime is 80871419. The next prime is 80871449. The reversal of 80871440 is 4417808.

It can be written as a sum of positive squares in 4 ways, for example, as 15376 + 80856064 = 124^2 + 8992^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 80871397 and 80871406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80871449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37841 + ... + 39920.

Almost surely, 2^80871440 is an apocalyptic number.

80871440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

80871440 is an abundant number, since it is smaller than the sum of its proper divisors (121620808).

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

80871440 is a wasteful number, since it uses less digits than its factorization.

80871440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77787 (or 77781 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 80871440 is about 8992.8549415633. The cubic root of 80871440 is about 432.4458417266.

The spelling of 80871440 in words is "eighty million, eight hundred seventy-one thousand, four hundred forty".