201723617728 has 56 divisors (see below), whose sum is σ = 425229477200. Its totient is φ = 94676594688.

The previous prime is 201723617707. The next prime is 201723617731. The reversal of 201723617728 is 827716327102.

201723617728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 628425 + ... + 893512.

Almost surely, 2^201723617728 is an apocalyptic number.

It is an amenable number.

201723617728 is an abundant number, since it is smaller than the sum of its proper divisors (223505859472).

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

201723617728 is a wasteful number, since it uses less digits than its factorization.

201723617728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522077 (or 1522067 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 201723617728 in words is "two hundred one billion, seven hundred twenty-three million, six hundred seventeen thousand, seven hundred twenty-eight".