445441640 has 64 divisors (see below), whose sum is σ = 1150588800. Its totient is φ = 152034048.

The previous prime is 445441603. The next prime is 445441657. The reversal of 445441640 is 46144544.

It is a junction number, because it is equal to n+sod(n) for n = 445441597 and 445441606.

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, 60647 + ... + 67593.

It is an arithmetic number, because the mean of its divisors is an integer number (17977950).

Almost surely, 2^445441640 is an apocalyptic number.

445441640 is a gapful number since it is divisible by the number (40) 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 445441640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (575294400).

445441640 is an abundant number, since it is smaller than the sum of its proper divisors (705147160).

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

445441640 is a wasteful number, since it uses less digits than its factorization.

445441640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7194 (or 7190 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 32.

The square root of 445441640 is about 21105.4883857256. The cubic root of 445441640 is about 763.7131540142.

The spelling of 445441640 in words is "four hundred forty-five million, four hundred forty-one thousand, six hundred forty".