445756820 has 18 divisors (see below), whose sum is σ = 936287646. Its totient is φ = 178264960.

The previous prime is 445756811. The next prime is 445756823. The reversal of 445756820 is 28657544.

It can be written as a sum of positive squares in 3 ways, for example, as 56010256 + 389746564 = 7484^2 + 19742^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445756823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92060 + ... + 96780.

Almost surely, 2^445756820 is an apocalyptic number.

It is an amenable number.

445756820 is an abundant number, since it is smaller than the sum of its proper divisors (490530826).

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

445756820 is an frugal number, since it uses more digits than its factorization.

445756820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9451 (or 4728 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 41.

The square root of 445756820 is about 21112.9538435530. The cubic root of 445756820 is about 763.8932377337.

The spelling of 445756820 in words is "four hundred forty-five million, seven hundred fifty-six thousand, eight hundred twenty".