164723643 has 36 divisors (see below), whose sum is σ = 278319600. Its totient is φ = 93604896.

The previous prime is 164723641. The next prime is 164723651. The reversal of 164723643 is 346327461.

It is a happy number.

164723643 is a `hidden beast` number, since 1 + 6 + 4 + 7 + 2 + 3 + 643 = 666.

It is not a de Polignac number, because 164723643 - 2¹ = 164723641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 164723598 and 164723607.

It is not an unprimeable number, because it can be changed into a prime (164723641) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 86821 + ... + 88697.

It is an arithmetic number, because the mean of its divisors is an integer number (7731100).

Almost surely, 2^164723643 is an apocalyptic number.

164723643 is a deficient number, since it is larger than the sum of its proper divisors (113595957).

164723643 is a wasteful number, since it uses less digits than its factorization.

164723643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096 (or 2086 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 164723643 is about 12834.4708889771. The cubic root of 164723643 is about 548.1742690373.

The spelling of 164723643 in words is "one hundred sixty-four million, seven hundred twenty-three thousand, six hundred forty-three".