64268817680 has 40 divisors (see below), whose sum is σ = 149501103192. Its totient is φ = 25694434304.

The previous prime is 64268817673. The next prime is 64268817689. The reversal of 64268817680 is 8671886246.

64268817680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4584373264 + 59684444416 = 67708^2 + 244304^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (64268817689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45749 + ... + 361428.

Almost surely, 2^64268817680 is an apocalyptic number.

It is an amenable number.

64268817680 is an abundant number, since it is smaller than the sum of its proper divisors (85232285512).

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

64268817680 is a wasteful number, since it uses less digits than its factorization.

64268817680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409163 (or 409157 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 56.

The spelling of 64268817680 in words is "sixty-four billion, two hundred sixty-eight million, eight hundred seventeen thousand, six hundred eighty".