640181046 has 8 divisors (see below), whose sum is σ = 1280362104. Its totient is φ = 213393680.

The previous prime is 640181029. The next prime is 640181051.

640181046 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

640181046 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53348415 + ... + 53348426.

It is an arithmetic number, because the mean of its divisors is an integer number (160045263).

Almost surely, 2^640181046 is an apocalyptic number.

640181046 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640181046 is a wasteful number, since it uses less digits than its factorization.

640181046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106696846.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 640181046 is about 25301.7992640840. The cubic root of 640181046 is about 861.8551291396.

The spelling of 640181046 in words is "six hundred forty million, one hundred eighty-one thousand, forty-six".