640153334 has 4 divisors (see below), whose sum is σ = 960230004. Its totient is φ = 320076666.

The previous prime is 640153331. The next prime is 640153351. The reversal of 640153334 is 433351046.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 640153297 and 640153306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640153331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160038332 + ... + 160038335.

It is an arithmetic number, because the mean of its divisors is an integer number (240057501).

Almost surely, 2^640153334 is an apocalyptic number.

640153334 is a deficient number, since it is larger than the sum of its proper divisors (320076670).

640153334 is a wasteful number, since it uses less digits than its factorization.

640153334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320076669.

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 640153334 is about 25301.2516291191. The cubic root of 640153334 is about 861.8426930357.

The spelling of 640153334 in words is "six hundred forty million, one hundred fifty-three thousand, three hundred thirty-four".