80821420 has 24 divisors (see below), whose sum is σ = 170226000. Its totient is φ = 32233152.

The previous prime is 80821399. The next prime is 80821423. The reversal of 80821420 is 2412808.

It is not an unprimeable number, because it can be changed into a prime (80821423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1191 + ... + 12769.

It is an arithmetic number, because the mean of its divisors is an integer number (7092750).

Almost surely, 2^80821420 is an apocalyptic number.

It is an amenable number.

80821420 is an abundant number, since it is smaller than the sum of its proper divisors (89404580).

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

80821420 is a wasteful number, since it uses less digits than its factorization.

80821420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11937 (or 11935 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 80821420 is about 8990.0734146057. The cubic root of 80821420 is about 432.3566656129.

The spelling of 80821420 in words is "eighty million, eight hundred twenty-one thousand, four hundred twenty".