640727076224648 has 32 divisors (see below), whose sum is σ = 1373221733318400. Its totient is φ = 274550290100352.

The previous prime is 640727076224639. The next prime is 640727076224681. The reversal of 640727076224648 is 846422670727046.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 979425965 + ... + 980079932.

It is an arithmetic number, because the mean of its divisors is an integer number (42913179166200).

Almost surely, 2^{640727076224648} is an apocalyptic number.

It is an amenable number.

640727076224648 is an abundant number, since it is smaller than the sum of its proper divisors (732494657093752).

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

640727076224648 is a wasteful number, since it uses less digits than its factorization.

640727076224648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959511749 (or 1959511745 counting only the distinct ones).

The product of its (nonzero) digits is 303464448, while the sum is 65.

The spelling of 640727076224648 in words is "six hundred forty trillion, seven hundred twenty-seven billion, seventy-six million, two hundred twenty-four thousand, six hundred forty-eight".