64642783460 has 12 divisors (see below), whose sum is σ = 135749845308. Its totient is φ = 25857113376.

The previous prime is 64642783453. The next prime is 64642783463. The reversal of 64642783460 is 6438724646.

It can be written as a sum of positive squares in 2 ways, for example, as 27524137216 + 37118646244 = 165904^2 + 192662^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64642783399 and 64642783408.

It is not an unprimeable number, because it can be changed into a prime (64642783463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616069567 + ... + 1616069606.

It is an arithmetic number, because the mean of its divisors is an integer number (11312487109).

Almost surely, 2^64642783460 is an apocalyptic number.

It is an amenable number.

64642783460 is an abundant number, since it is smaller than the sum of its proper divisors (71107061848).

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

64642783460 is a wasteful number, since it uses less digits than its factorization.

64642783460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3232139182 (or 3232139180 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 50.

The spelling of 64642783460 in words is "sixty-four billion, six hundred forty-two million, seven hundred eighty-three thousand, four hundred sixty".