640710144 has 120 divisors (see below), whose sum is σ = 1958144760. Its totient is φ = 200982528.

The previous prime is 640710143. The next prime is 640710193. The reversal of 640710144 is 441017046.

640710144 is a `hidden beast` number, since 640 + 7 + 1 + 0 + 14 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640710143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74247 + ... + 82425.

It is an arithmetic number, because the mean of its divisors is an integer number (16317873).

Almost surely, 2^640710144 is an apocalyptic number.

640710144 is a gapful number since it is divisible by the number (64) 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 640710144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (979072380).

640710144 is an abundant number, since it is smaller than the sum of its proper divisors (1317434616).

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

640710144 is a wasteful number, since it uses less digits than its factorization.

640710144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8220 (or 8201 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 640710144 is about 25312.2528432378. The cubic root of 640710144 is about 862.0924996245.

The spelling of 640710144 in words is "six hundred forty million, seven hundred ten thousand, one hundred forty-four".