640174768 has 40 divisors (see below), whose sum is σ = 1291747680. Its totient is φ = 306969600.

The previous prime is 640174751. The next prime is 640174781. The reversal of 640174768 is 867471046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65496 + ... + 74632.

It is an arithmetic number, because the mean of its divisors is an integer number (32293692).

Almost surely, 2^640174768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640174768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (645873840).

640174768 is an abundant number, since it is smaller than the sum of its proper divisors (651572912).

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

640174768 is a wasteful number, since it uses less digits than its factorization.

640174768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9325 (or 9319 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 640174768 is about 25301.6752014565. The cubic root of 640174768 is about 861.8523118406.

The spelling of 640174768 in words is "six hundred forty million, one hundred seventy-four thousand, seven hundred sixty-eight".