640714581234 has 192 divisors, whose sum is σ = 1718896128768. Its totient is φ = 167961600000.

The previous prime is 640714581209. The next prime is 640714581277. The reversal of 640714581234 is 432185417046.

640714581234 is a `hidden beast` number, since 6 + 4 + 0 + 71 + 458 + 123 + 4 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 640714581234.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 247092642 + ... + 247095234.

It is an arithmetic number, because the mean of its divisors is an integer number (8952584004).

Almost surely, 2^640714581234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640714581234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (859448064384).

640714581234 is an abundant number, since it is smaller than the sum of its proper divisors (1078181547534).

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

640714581234 is a wasteful number, since it uses less digits than its factorization.

640714581234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3473 (or 3470 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 640714581234 in words is "six hundred forty billion, seven hundred fourteen million, five hundred eighty-one thousand, two hundred thirty-four".