640020260260 has 48 divisors (see below), whose sum is σ = 1360139155200. Its totient is φ = 252952502400.

The previous prime is 640020260189. The next prime is 640020260287. The reversal of 640020260260 is 62062020046.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 658441 + ... + 1309039.

It is an arithmetic number, because the mean of its divisors is an integer number (28336232400).

Almost surely, 2^640020260260 is an apocalyptic number.

It is an amenable number.

640020260260 is an abundant number, since it is smaller than the sum of its proper divisors (720118894940).

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

640020260260 is a wasteful number, since it uses less digits than its factorization.

640020260260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651196 (or 651194 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The spelling of 640020260260 in words is "six hundred forty billion, twenty million, two hundred sixty thousand, two hundred sixty".