445385640 has 128 divisors (see below), whose sum is σ = 1532160000. Its totient is φ = 101461248.

The previous prime is 445385623. The next prime is 445385653. The reversal of 445385640 is 46583544.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 317661 + ... + 319059.

It is an arithmetic number, because the mean of its divisors is an integer number (11970000).

Almost surely, 2^445385640 is an apocalyptic number.

445385640 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 445385640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (766080000).

445385640 is an abundant number, since it is smaller than the sum of its proper divisors (1086774360).

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

445385640 is a wasteful number, since it uses less digits than its factorization.

445385640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799 (or 1795 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 39.

The square root of 445385640 is about 21104.1616748925. The cubic root of 445385640 is about 763.6811485279.

The spelling of 445385640 in words is "four hundred forty-five million, three hundred eighty-five thousand, six hundred forty".