166728093 has 32 divisors (see below), whose sum is σ = 261642240. Its totient is φ = 92473920.

The previous prime is 166728091. The next prime is 166728113. The reversal of 166728093 is 390827661.

It is a happy number.

It is not a de Polignac number, because 166728093 - 2¹ = 166728091 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166728091) 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 31 ways as a sum of consecutive naturals, for example, 99063 + ... + 100731.

It is an arithmetic number, because the mean of its divisors is an integer number (8176320).

Almost surely, 2^166728093 is an apocalyptic number.

It is an amenable number.

166728093 is a deficient number, since it is larger than the sum of its proper divisors (94914147).

166728093 is a wasteful number, since it uses less digits than its factorization.

166728093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 166728093 is about 12912.3232998558. The cubic root of 166728093 is about 550.3888082729.

The spelling of 166728093 in words is "one hundred sixty-six million, seven hundred twenty-eight thousand, ninety-three".