640342134 has 12 divisors (see below), whose sum is σ = 1387407996. Its totient is φ = 213447372.

The previous prime is 640342133. The next prime is 640342139. The reversal of 640342134 is 431243046.

640342134 is a `hidden beast` number, since 640 + 3 + 4 + 2 + 13 + 4 = 666.

640342134 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 640342098 and 640342107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640342133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17787264 + ... + 17787299.

It is an arithmetic number, because the mean of its divisors is an integer number (115617333).

Almost surely, 2^640342134 is an apocalyptic number.

640342134 is an abundant number, since it is smaller than the sum of its proper divisors (747065862).

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

640342134 is a wasteful number, since it uses less digits than its factorization.

640342134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35574571 (or 35574568 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 640342134 is about 25304.9823947775. The cubic root of 640342134 is about 861.9274122729.

The spelling of 640342134 in words is "six hundred forty million, three hundred forty-two thousand, one hundred thirty-four".