164672731 has 4 divisors (see below), whose sum is σ = 166183600. Its totient is φ = 163161864.

The previous prime is 164672707. The next prime is 164672737. The reversal of 164672731 is 137276461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 164672731 - 2⁷ = 164672603 is a prime.

It is a super-2 number, since 2×164672731² = 54234216669996722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164672737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755271 + ... + 755488.

It is an arithmetic number, because the mean of its divisors is an integer number (41545900).

Almost surely, 2^164672731 is an apocalyptic number.

164672731 is a deficient number, since it is larger than the sum of its proper divisors (1510869).

164672731 is a wasteful number, since it uses less digits than its factorization.

164672731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510868.

The product of its digits is 42336, while the sum is 37.

The square root of 164672731 is about 12832.4873270929. The cubic root of 164672731 is about 548.1177875194.

The spelling of 164672731 in words is "one hundred sixty-four million, six hundred seventy-two thousand, seven hundred thirty-one".