1640064 has 32 divisors (see below), whose sum is σ = 4357440. Its totient is φ = 546560.

The previous prime is 1640059. The next prime is 1640071. The reversal of 1640064 is 4600461.

It is a tau number, because it is divible by the number of its divisors (32).

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1640064.

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, 1752 + ... + 2519.

It is an arithmetic number, because the mean of its divisors is an integer number (136170).

2^1640064 is an apocalyptic number.

It is an amenable number.

1640064 is an abundant number, since it is smaller than the sum of its proper divisors (2717376).

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

1640064 is an equidigital number, since it uses as much as digits as its factorization.

1640064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288 (or 4276 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1640064 is about 1280.6498350447. The cubic root of 1640064 is about 117.9289047940.

The spelling of 1640064 in words is "one million, six hundred forty thousand, sixty-four".