640428140712 has 64 divisors (see below), whose sum is σ = 1685452608000. Its totient is φ = 202226618304.

The previous prime is 640428140699. The next prime is 640428140767. The reversal of 640428140712 is 217041824046.

640428140712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 8150203 + ... + 8228405.

It is an arithmetic number, because the mean of its divisors is an integer number (26335197000).

Almost surely, 2^640428140712 is an apocalyptic number.

It is an amenable number.

640428140712 is an abundant number, since it is smaller than the sum of its proper divisors (1045024467288).

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

640428140712 is a wasteful number, since it uses less digits than its factorization.

640428140712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96190 (or 96186 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 39.

Adding to 640428140712 its reverse (217041824046), we get a palindrome (857469964758).

The spelling of 640428140712 in words is "six hundred forty billion, four hundred twenty-eight million, one hundred forty thousand, seven hundred twelve".