80217680 has 20 divisors (see below), whose sum is σ = 186506292. Its totient is φ = 32087040.

The previous prime is 80217653. The next prime is 80217691. The reversal of 80217680 is 8671208.

It can be written as a sum of positive squares in 2 ways, for example, as 29637136 + 50580544 = 5444^2 + 7112^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501281 + ... + 501440.

Almost surely, 2^80217680 is an apocalyptic number.

80217680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

80217680 is an abundant number, since it is smaller than the sum of its proper divisors (106288612).

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

80217680 is a wasteful number, since it uses less digits than its factorization.

80217680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002734 (or 1002728 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 80217680 is about 8956.4323254296. The cubic root of 80217680 is about 431.2773985253.

Adding to 80217680 its reverse (8671208), we get a palindrome (88888888).

The spelling of 80217680 in words is "eighty million, two hundred seventeen thousand, six hundred eighty".