805447980 has 36 divisors (see below), whose sum is σ = 2443192752. Its totient is φ = 214786080.

The previous prime is 805447961. The next prime is 805447987. The reversal of 805447980 is 89744508.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (805447987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2237176 + ... + 2237535.

Almost surely, 2^805447980 is an apocalyptic number.

It is an amenable number.

805447980 is an abundant number, since it is smaller than the sum of its proper divisors (1637744772).

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

805447980 is a wasteful number, since it uses less digits than its factorization.

805447980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4474726 (or 4474721 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 805447980 is about 28380.4154303632. The cubic root of 805447980 is about 930.4202748393.

The spelling of 805447980 in words is "eight hundred five million, four hundred forty-seven thousand, nine hundred eighty".