164890 has 16 divisors (see below), whose sum is σ = 324000. Its totient is φ = 59920.

The previous prime is 164881. The next prime is 164893. The reversal of 164890 is 98461.

It is not an unprimeable number, because it can be changed into a prime (164893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640 + ... + 859.

It is an arithmetic number, because the mean of its divisors is an integer number (20250).

2¹⁶⁴⁸⁹⁰ is an apocalyptic number.

164890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

164890 is a deficient number, since it is larger than the sum of its proper divisors (159110).

164890 is a wasteful number, since it uses less digits than its factorization.

164890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 164890 is about 406.0664970174. The cubic root of 164890 is about 54.8358743558.

The spelling of 164890 in words is "one hundred sixty-four thousand, eight hundred ninety".