845287440 has 80 divisors (see below), whose sum is σ = 2656341888. Its totient is φ = 222317568.

The previous prime is 845287427. The next prime is 845287441. The reversal of 845287440 is 44782548.

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

It is a junction number, because it is equal to n+sod(n) for n = 845287392 and 845287401.

It is not an unprimeable number, because it can be changed into a prime (845287441) 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, 6604 + ... + 41643.

Almost surely, 2^845287440 is an apocalyptic number.

845287440 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 845287440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1328170944).

845287440 is an abundant number, since it is smaller than the sum of its proper divisors (1811054448).

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

845287440 is a wasteful number, since it uses less digits than its factorization.

845287440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48336 (or 48330 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 42.

The square root of 845287440 is about 29073.8274054174. The cubic root of 845287440 is about 945.5143808061.

The spelling of 845287440 in words is "eight hundred forty-five million, two hundred eighty-seven thousand, four hundred forty".