80605821 has 8 divisors (see below), whose sum is σ = 107531424. Its totient is φ = 53708720.

The previous prime is 80605817. The next prime is 80605831. The reversal of 80605821 is 12850608.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80605821 - 2² = 80605817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80605831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 706 + ... + 12716.

It is an arithmetic number, because the mean of its divisors is an integer number (13441428).

Almost surely, 2^80605821 is an apocalyptic number.

It is an amenable number.

80605821 is a deficient number, since it is larger than the sum of its proper divisors (26925603).

80605821 is a wasteful number, since it uses less digits than its factorization.

80605821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14251.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 80605821 is about 8978.0744594818. The cubic root of 80605821 is about 431.9718720969.

The spelling of 80605821 in words is "eighty million, six hundred five thousand, eight hundred twenty-one".