1845445128 has 64 divisors (see below), whose sum is σ = 4800184320. Its totient is φ = 590587200.

The previous prime is 1845445117. The next prime is 1845445169. The reversal of 1845445128 is 8215445481.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1845445128.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84723 + ... + 104253.

It is an arithmetic number, because the mean of its divisors is an integer number (75002880).

Almost surely, 2^1845445128 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 1845445128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2400092160).

1845445128 is an abundant number, since it is smaller than the sum of its proper divisors (2954739192).

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

1845445128 is a wasteful number, since it uses less digits than its factorization.

1845445128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19698 (or 19694 counting only the distinct ones).

The product of its digits is 204800, while the sum is 42.

The square root of 1845445128 is about 42958.6443920196. The cubic root of 1845445128 is about 1226.5927089285.

The spelling of 1845445128 in words is "one billion, eight hundred forty-five million, four hundred forty-five thousand, one hundred twenty-eight".