440640064 has 14 divisors (see below), whose sum is σ = 874395254. Its totient is φ = 220320000.

The previous prime is 440640061. The next prime is 440640091. The reversal of 440640064 is 460046044.

It can be written as a sum of positive squares in only one way, i.e., 399680064 + 40960000 = 19992^2 + 6400^2 .

It is not an unprimeable number, because it can be changed into a prime (440640061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3442437 + ... + 3442564.

Almost surely, 2^440640064 is an apocalyptic number.

It is an amenable number.

440640064 is a deficient number, since it is larger than the sum of its proper divisors (433755190).

440640064 is an equidigital number, since it uses as much as digits as its factorization.

440640064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6885013 (or 6885003 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 440640064 is about 20991.4283458749. The cubic root of 440640064 is about 760.9591214876.

The spelling of 440640064 in words is "four hundred forty million, six hundred forty thousand, sixty-four".