445581820 has 24 divisors (see below), whose sum is σ = 951064128. Its totient is φ = 175310400.

The previous prime is 445581803. The next prime is 445581827. The reversal of 445581820 is 28185544.

It is a self number, because there is not a number n which added to its sum of digits gives 445581820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445581827) 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, 181396 + ... + 183835.

It is an arithmetic number, because the mean of its divisors is an integer number (39627672).

Almost surely, 2^445581820 is an apocalyptic number.

It is an amenable number.

445581820 is an abundant number, since it is smaller than the sum of its proper divisors (505482308).

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

445581820 is a wasteful number, since it uses less digits than its factorization.

445581820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365301 (or 365299 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 37.

The square root of 445581820 is about 21108.8090616216. The cubic root of 445581820 is about 763.7932588450.

The spelling of 445581820 in words is "four hundred forty-five million, five hundred eighty-one thousand, eight hundred twenty".