164578745 has 8 divisors (see below), whose sum is σ = 197603016. Its totient is φ = 131590656.

The previous prime is 164578723. The next prime is 164578753. The reversal of 164578745 is 547875461.

It can be written as a sum of positive squares in 4 ways, for example, as 200704 + 164378041 = 448^2 + 12821^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 164578745 - 2¹² = 164574649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164578745.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2249 + ... + 18281.

It is an arithmetic number, because the mean of its divisors is an integer number (24700377).

Almost surely, 2^164578745 is an apocalyptic number.

It is an amenable number.

164578745 is a deficient number, since it is larger than the sum of its proper divisors (33024271).

164578745 is a wasteful number, since it uses less digits than its factorization.

164578745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18091.

The product of its digits is 940800, while the sum is 47.

The square root of 164578745 is about 12828.8247708042. The cubic root of 164578745 is about 548.0134893318.

The spelling of 164578745 in words is "one hundred sixty-four million, five hundred seventy-eight thousand, seven hundred forty-five".