643748200704 has 144 divisors (see below), whose sum is σ = 2175630656640. Its totient is φ = 183928043520.

The previous prime is 643748200699. The next prime is 643748200741. The reversal of 643748200704 is 407002847346.

643748200704 is a `hidden beast` number, since 6 + 4 + 374 + 8 + 200 + 70 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 643748200704.

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, 6604107 + ... + 6700874.

Almost surely, 2^643748200704 is an apocalyptic number.

643748200704 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

643748200704 is an abundant number, since it is smaller than the sum of its proper divisors (1531882455936).

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

643748200704 is a wasteful number, since it uses less digits than its factorization.

643748200704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13305013 (or 13304993 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 45.

The spelling of 643748200704 in words is "six hundred forty-three billion, seven hundred forty-eight million, two hundred thousand, seven hundred four".