640462662228 has 48 divisors (see below), whose sum is σ = 1509503063040. Its totient is φ = 211340669664.

The previous prime is 640462662193. The next prime is 640462662241. The reversal of 640462662228 is 822266264046.

It is a congruent number.

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, 25525 + ... + 1132067.

It is an arithmetic number, because the mean of its divisors is an integer number (31447980480).

Almost surely, 2^640462662228 is an apocalyptic number.

It is an amenable number.

640462662228 is an abundant number, since it is smaller than the sum of its proper divisors (869040400812).

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

640462662228 is a wasteful number, since it uses less digits than its factorization.

640462662228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107036 (or 1107034 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 48.

The spelling of 640462662228 in words is "six hundred forty billion, four hundred sixty-two million, six hundred sixty-two thousand, two hundred twenty-eight".