640200240 has 160 divisors (see below), whose sum is σ = 2259230400. Its totient is φ = 166533120.

The previous prime is 640200221. The next prime is 640200271. The reversal of 640200240 is 42002046.

640200240 is a `hidden beast` number, since 640 + 2 + 0 + 0 + 24 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84946 + ... + 92174.

It is an arithmetic number, because the mean of its divisors is an integer number (14120190).

Almost surely, 2^640200240 is an apocalyptic number.

640200240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640200240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1129615200).

640200240 is an abundant number, since it is smaller than the sum of its proper divisors (1619030160).

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

640200240 is a wasteful number, since it uses less digits than its factorization.

640200240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7292 (or 7280 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 640200240 is about 25302.1785623294. The cubic root of 640200240 is about 861.8637424749.

Adding to 640200240 its reverse (42002046), we get a palindrome (682202286).

The spelling of 640200240 in words is "six hundred forty million, two hundred thousand, two hundred forty".