164185518728 has 96 divisors (see below), whose sum is σ = 398035632960. Its totient is φ = 62761345920.

The previous prime is 164185518709. The next prime is 164185518733. The reversal of 164185518728 is 827815581461.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130676 + ... + 587747.

It is an arithmetic number, because the mean of its divisors is an integer number (4146204510).

Almost surely, 2^164185518728 is an apocalyptic number.

It is an amenable number.

164185518728 is an abundant number, since it is smaller than the sum of its proper divisors (233850114232).

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

164185518728 is a wasteful number, since it uses less digits than its factorization.

164185518728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718507 (or 718496 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 56.

The spelling of 164185518728 in words is "one hundred sixty-four billion, one hundred eighty-five million, five hundred eighteen thousand, seven hundred twenty-eight".