164638893 has 8 divisors (see below), whose sum is σ = 220503808. Its totient is φ = 109266624.

The previous prime is 164638889. The next prime is 164638907. The reversal of 164638893 is 398836461.

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

It is not a de Polignac number, because 164638893 - 2² = 164638889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164638823) 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, 122380 + ... + 123717.

It is an arithmetic number, because the mean of its divisors is an integer number (27562976).

Almost surely, 2^164638893 is an apocalyptic number.

It is an amenable number.

164638893 is a deficient number, since it is larger than the sum of its proper divisors (55864915).

164638893 is a wasteful number, since it uses less digits than its factorization.

164638893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246323.

The product of its digits is 746496, while the sum is 48.

The square root of 164638893 is about 12831.1688088030. The cubic root of 164638893 is about 548.0802413713.

The spelling of 164638893 in words is "one hundred sixty-four million, six hundred thirty-eight thousand, eight hundred ninety-three".