845439280 has 80 divisors (see below), whose sum is σ = 2277336384. Its totient is φ = 285880320.

The previous prime is 845439271. The next prime is 845439281. The reversal of 845439280 is 82934548.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (845439281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30540 + ... + 51220.

Almost surely, 2^845439280 is an apocalyptic number.

845439280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 845439280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1138668192).

845439280 is an abundant number, since it is smaller than the sum of its proper divisors (1431897104).

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

845439280 is a wasteful number, since it uses less digits than its factorization.

845439280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20774 (or 20768 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 845439280 is about 29076.4385714619. The cubic root of 845439280 is about 945.5709920451.

The spelling of 845439280 in words is "eight hundred forty-five million, four hundred thirty-nine thousand, two hundred eighty".