640361676 has 96 divisors (see below), whose sum is σ = 1617960960. Its totient is φ = 196612416.

The previous prime is 640361669. The next prime is 640361677. The reversal of 640361676 is 676163046.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (640361677) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 937231 + ... + 937913.

It is an arithmetic number, because the mean of its divisors is an integer number (16853760).

Almost surely, 2^640361676 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 640361676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (808980480).

640361676 is an abundant number, since it is smaller than the sum of its proper divisors (977599284).

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

640361676 is a wasteful number, since it uses less digits than its factorization.

640361676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 640361676 is about 25305.3685213237. The cubic root of 640361676 is about 861.9361803014.

The spelling of 640361676 in words is "six hundred forty million, three hundred sixty-one thousand, six hundred seventy-six".