64608071640 has 128 divisors (see below), whose sum is σ = 224633502720. Its totient is φ = 14559552000.

The previous prime is 64608071629. The next prime is 64608071641. The reversal of 64608071640 is 4617080646.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 64608071592 and 64608071601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64608071641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 482011 + ... + 601290.

It is an arithmetic number, because the mean of its divisors is an integer number (1754949240).

Almost surely, 2^64608071640 is an apocalyptic number.

64608071640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64608071640 is an abundant number, since it is smaller than the sum of its proper divisors (160025431080).

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

64608071640 is a wasteful number, since it uses less digits than its factorization.

64608071640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083393 (or 1083389 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 64608071640 in words is "sixty-four billion, six hundred eight million, seventy-one thousand, six hundred forty".