809546380 has 48 divisors (see below), whose sum is σ = 1772505504. Its totient is φ = 310302720.

The previous prime is 809546363. The next prime is 809546389. The reversal of 809546380 is 83645908.

It is a super-2 number, since 2×809546380² = 1310730682742208800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (809546389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36700 + ... + 54460.

It is an arithmetic number, because the mean of its divisors is an integer number (36927198).

Almost surely, 2^809546380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 809546380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886252752).

809546380 is an abundant number, since it is smaller than the sum of its proper divisors (962959124).

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

809546380 is a wasteful number, since it uses less digits than its factorization.

809546380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17866 (or 17864 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 809546380 is about 28452.5285343851. The cubic root of 809546380 is about 931.9957065997.

The spelling of 809546380 in words is "eight hundred nine million, five hundred forty-six thousand, three hundred eighty".