640134262326 has 32 divisors (see below), whose sum is σ = 1381000007520. Its totient is φ = 196643061504.

The previous prime is 640134262247. The next prime is 640134262351. The reversal of 640134262326 is 623262431046.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6646191 + ... + 6741818.

It is an arithmetic number, because the mean of its divisors is an integer number (43156250235).

Almost surely, 2^640134262326 is an apocalyptic number.

640134262326 is an abundant number, since it is smaller than the sum of its proper divisors (740865745194).

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

640134262326 is a wasteful number, since it uses less digits than its factorization.

640134262326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13388640.

The product of its (nonzero) digits is 248832, while the sum is 39.

The spelling of 640134262326 in words is "six hundred forty billion, one hundred thirty-four million, two hundred sixty-two thousand, three hundred twenty-six".