445399680 has 128 divisors (see below), whose sum is σ = 1548849600. Its totient is φ = 107970560.

The previous prime is 445399679. The next prime is 445399697. The reversal of 445399680 is 86993544.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 10576 + ... + 31664.

Almost surely, 2^445399680 is an apocalyptic number.

445399680 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 445399680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (774424800).

445399680 is an abundant number, since it is smaller than the sum of its proper divisors (1103449920).

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

445399680 is a wasteful number, since it uses less digits than its factorization.

445399680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21122 (or 21110 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 48.

The square root of 445399680 is about 21104.4943080852. The cubic root of 445399680 is about 763.6891730125.

The spelling of 445399680 in words is "four hundred forty-five million, three hundred ninety-nine thousand, six hundred eighty".