444540064 has 24 divisors (see below), whose sum is σ = 875835828. Its totient is φ = 222105600.

The previous prime is 444540011. The next prime is 444540071. The reversal of 444540064 is 460045444.

It can be written as a sum of positive squares in 2 ways, for example, as 418611600 + 25928464 = 20460^2 + 5092^2 .

It is a super-2 number, since 2×444540064² = 395231737002248192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46894 + ... + 55570.

Almost surely, 2^444540064 is an apocalyptic number.

It is an amenable number.

444540064 is a deficient number, since it is larger than the sum of its proper divisors (431295764).

444540064 is a wasteful number, since it uses less digits than its factorization.

444540064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10288 (or 10280 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 31.

The square root of 444540064 is about 21084.1187627086. The cubic root of 444540064 is about 763.1975529781.

The spelling of 444540064 in words is "four hundred forty-four million, five hundred forty thousand, sixty-four".