640046000 has 160 divisors (see below), whose sum is σ = 1727032320. Its totient is φ = 227424000.

The previous prime is 640045999. The next prime is 640046009. The reversal of 640046000 is 640046.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (640046009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1033691 + ... + 1034309.

It is an arithmetic number, because the mean of its divisors is an integer number (10793952).

Almost surely, 2^640046000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640046000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (863516160).

640046000 is an abundant number, since it is smaller than the sum of its proper divisors (1086986320).

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

640046000 is a wasteful number, since it uses less digits than its factorization.

640046000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 640046000 is about 25299.1304198385. The cubic root of 640046000 is about 861.7945221839.

Adding to 640046000 its reverse (640046), we get a palindrome (640686046).

640046000 divided by its reverse (640046) gives a cube (1000 = 10³).

The spelling of 640046000 in words is "six hundred forty million, forty-six thousand".