64384895640 has 64 divisors (see below), whose sum is σ = 208012744800. Its totient is φ = 15848589312.

The previous prime is 64384895639. The next prime is 64384895657. The reversal of 64384895640 is 4659848346.

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, 20634625 + ... + 20637744.

Almost surely, 2^64384895640 is an apocalyptic number.

64384895640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64384895640 is an abundant number, since it is smaller than the sum of its proper divisors (143627849160).

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

64384895640 is a wasteful number, since it uses less digits than its factorization.

64384895640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41272396 (or 41272392 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 57.

The spelling of 64384895640 in words is "sixty-four billion, three hundred eighty-four million, eight hundred ninety-five thousand, six hundred forty".