445640563 has 4 divisors (see below), whose sum is σ = 452946208. Its totient is φ = 438334920.

The previous prime is 445640557. The next prime is 445640581. The reversal of 445640563 is 365046544.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 445640563 - 2⁹ = 445640051 is a prime.

It is a super-2 number, since 2×445640563² = 397191022781913938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445640513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3652731 + ... + 3652852.

It is an arithmetic number, because the mean of its divisors is an integer number (113236552).

Almost surely, 2^445640563 is an apocalyptic number.

445640563 is a deficient number, since it is larger than the sum of its proper divisors (7305645).

445640563 is an equidigital number, since it uses as much as digits as its factorization.

445640563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7305644.

The product of its (nonzero) digits is 172800, while the sum is 37.

The square root of 445640563 is about 21110.2004490720. The cubic root of 445640563 is about 763.8268221053.

The spelling of 445640563 in words is "four hundred forty-five million, six hundred forty thousand, five hundred sixty-three".