640484600260 has 12 divisors (see below), whose sum is σ = 1345017660588. Its totient is φ = 256193840096.

The previous prime is 640484600251. The next prime is 640484600293. The reversal of 640484600260 is 62006484046.

It can be written as a sum of positive squares in 2 ways, for example, as 117764276224 + 522720324036 = 343168^2 + 722994^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16012114987 + ... + 16012115026.

It is an arithmetic number, because the mean of its divisors is an integer number (112084805049).

Almost surely, 2^640484600260 is an apocalyptic number.

It is an amenable number.

640484600260 is an abundant number, since it is smaller than the sum of its proper divisors (704533060328).

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

640484600260 is a wasteful number, since it uses less digits than its factorization.

640484600260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32024230022 (or 32024230020 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The spelling of 640484600260 in words is "six hundred forty billion, four hundred eighty-four million, six hundred thousand, two hundred sixty".