640063336 has 32 divisors (see below), whose sum is σ = 1378130400. Its totient is φ = 275624640.

The previous prime is 640063313. The next prime is 640063339. The reversal of 640063336 is 633360046.

It is a junction number, because it is equal to n+sod(n) for n = 640063298 and 640063307.

It is not an unprimeable number, because it can be changed into a prime (640063339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189735 + ... + 193078.

It is an arithmetic number, because the mean of its divisors is an integer number (43066575).

Almost surely, 2^640063336 is an apocalyptic number.

It is an amenable number.

640063336 is an abundant number, since it is smaller than the sum of its proper divisors (738067064).

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

640063336 is a wasteful number, since it uses less digits than its factorization.

640063336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382849 (or 382845 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 31.

The square root of 640063336 is about 25299.4730379903. The cubic root of 640063336 is about 861.8023028408.

The spelling of 640063336 in words is "six hundred forty million, sixty-three thousand, three hundred thirty-six".