640756606248 has 48 divisors (see below), whose sum is σ = 1893144520800. Its totient is φ = 194168668320.

The previous prime is 640756606247. The next prime is 640756606267. The reversal of 640756606248 is 842606657046.

640756606248 is a `hidden beast` number, since 6 + 4 + 0 + 7 + 5 + 6 + 6 + 0 + 624 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 640756606194 and 640756606203.

It is not an unprimeable number, because it can be changed into a prime (640756606247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 404517268 + ... + 404518851.

It is an arithmetic number, because the mean of its divisors is an integer number (39440510850).

Almost surely, 2^640756606248 is an apocalyptic number.

It is an amenable number.

640756606248 is an abundant number, since it is smaller than the sum of its proper divisors (1252387914552).

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

640756606248 is a wasteful number, since it uses less digits than its factorization.

640756606248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809036142 (or 809036135 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 54.

The spelling of 640756606248 in words is "six hundred forty billion, seven hundred fifty-six million, six hundred six thousand, two hundred forty-eight".