164788769 has 4 divisors (see below), whose sum is σ = 174482244. Its totient is φ = 155095296.

The previous prime is 164788763. The next prime is 164788783. The reversal of 164788769 is 967887461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 967887461 = 149 ⋅6495889.

It can be written as a sum of positive squares in 2 ways, for example, as 145323025 + 19465744 = 12055^2 + 4412^2 .

It is a cyclic number.

It is not a de Polignac number, because 164788769 - 2¹⁶ = 164723233 is a prime.

It is a super-2 number, since 2×164788769² = 54310676777070722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (164788763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4846712 + ... + 4846745.

It is an arithmetic number, because the mean of its divisors is an integer number (43620561).

Almost surely, 2^164788769 is an apocalyptic number.

It is an amenable number.

164788769 is a deficient number, since it is larger than the sum of its proper divisors (9693475).

164788769 is an equidigital number, since it uses as much as digits as its factorization.

164788769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9693474.

The product of its digits is 4064256, while the sum is 56.

The square root of 164788769 is about 12837.0077899797. The cubic root of 164788769 is about 548.2465025328.

The spelling of 164788769 in words is "one hundred sixty-four million, seven hundred eighty-eight thousand, seven hundred sixty-nine".