164781 has 16 divisors (see below), whose sum is σ = 259200. Its totient is φ = 103104.

The previous prime is 164771. The next prime is 164789. The reversal of 164781 is 187461.

It is a happy number.

164781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 164781 - 2⁷ = 164653 is a prime.

It is a super-2 number, since 2×164781² = 54305555922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 164781.

It is not an unprimeable number, because it can be changed into a prime (164789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280 + ... + 638.

It is an arithmetic number, because the mean of its divisors is an integer number (16200).

2¹⁶⁴⁷⁸¹ is an apocalyptic number.

It is an amenable number.

164781 is a deficient number, since it is larger than the sum of its proper divisors (94419).

164781 is a wasteful number, since it uses less digits than its factorization.

164781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 379 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 164781 is about 405.9322603588. The cubic root of 164781 is about 54.8237886666.

It can be divided in two parts, 1647 and 81, that added together give a cube (1728 = 12³).

The spelling of 164781 in words is "one hundred sixty-four thousand, seven hundred eighty-one".