445780 has 24 divisors (see below), whose sum is σ = 967680. Its totient is φ = 172320.

The previous prime is 445771. The next prime is 445789. The reversal of 445780 is 87544.

It is an interprime number because it is at equal distance from previous prime (445771) and next prime (445789).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261 + ... + 979.

It is an arithmetic number, because the mean of its divisors is an integer number (40320).

2⁴⁴⁵⁷⁸⁰ 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 445780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (483840).

445780 is an abundant number, since it is smaller than the sum of its proper divisors (521900).

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

445780 is a wasteful number, since it uses less digits than its factorization.

445780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759 (or 757 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 445780 is about 667.6675819598. The cubic root of 445780 is about 76.3906478689.

It can be divided in two parts, 445 and 780, that added together give a triangular number (1225 = T₄₉).

The spelling of 445780 in words is "four hundred forty-five thousand, seven hundred eighty".