80821688 has 16 divisors (see below), whose sum is σ = 151839360. Its totient is φ = 40331200.

The previous prime is 80821633. The next prime is 80821721. The reversal of 80821688 is 88612808.

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, 5528 + ... + 13863.

It is an arithmetic number, because the mean of its divisors is an integer number (9489960).

Almost surely, 2^80821688 is an apocalyptic number.

It is an amenable number.

80821688 is a deficient number, since it is larger than the sum of its proper divisors (71017672).

80821688 is a wasteful number, since it uses less digits than its factorization.

80821688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19918 (or 19914 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 41.

The square root of 80821688 is about 8990.0883199221. The cubic root of 80821688 is about 432.3571435037.

The spelling of 80821688 in words is "eighty million, eight hundred twenty-one thousand, six hundred eighty-eight".