664323273 has 12 divisors (see below), whose sum is σ = 990532608. Its totient is φ = 428595480.

The previous prime is 664323251. The next prime is 664323293. The reversal of 664323273 is 372323466.

664323273 is a `hidden beast` number, since 6 + 64 + 323 + 273 = 666.

It is not a de Polignac number, because 664323273 - 2⁵ = 664323241 is a prime.

It is a super-2 number, since 2×664323273² = 882650822098865058, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (664323223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1190265 + ... + 1190822.

It is an arithmetic number, because the mean of its divisors is an integer number (82544384).

Almost surely, 2^664323273 is an apocalyptic number.

It is an amenable number.

664323273 is a deficient number, since it is larger than the sum of its proper divisors (326209335).

664323273 is a wasteful number, since it uses less digits than its factorization.

664323273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381124 (or 2381121 counting only the distinct ones).

The product of its digits is 108864, while the sum is 36.

The square root of 664323273 is about 25774.4694028801. The cubic root of 664323273 is about 872.5556916091. Note that the first 3 decimals are identical.

The spelling of 664323273 in words is "six hundred sixty-four million, three hundred twenty-three thousand, two hundred seventy-three".