64891595760 has 80 divisors (see below), whose sum is σ = 204166444416. Its totient is φ = 17046146304.

The previous prime is 64891595759. The next prime is 64891595777. The reversal of 64891595760 is 6759519846.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 64891595694 and 64891595703.

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, 2001694 + ... + 2033853.

Almost surely, 2^64891595760 is an apocalyptic number.

64891595760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64891595760 is an abundant number, since it is smaller than the sum of its proper divisors (139274848656).

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

64891595760 is a wasteful number, since it uses less digits than its factorization.

64891595760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4035630 (or 4035624 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 60.

The spelling of 64891595760 in words is "sixty-four billion, eight hundred ninety-one million, five hundred ninety-five thousand, seven hundred sixty".