80688821 has 4 divisors (see below), whose sum is σ = 80711232. Its totient is φ = 80666412.

The previous prime is 80688809. The next prime is 80688827. The reversal of 80688821 is 12888608.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80688821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80688827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4445 + ... + 13458.

It is an arithmetic number, because the mean of its divisors is an integer number (20177808).

Almost surely, 2^80688821 is an apocalyptic number.

It is an amenable number.

80688821 is a deficient number, since it is larger than the sum of its proper divisors (22411).

80688821 is a wasteful number, since it uses less digits than its factorization.

80688821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22410.

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

The square root of 80688821 is about 8982.6956421778. The cubic root of 80688821 is about 432.1200887136.

The spelling of 80688821 in words is "eighty million, six hundred eighty-eight thousand, eight hundred twenty-one".