664271726 has 8 divisors (see below), whose sum is σ = 997959144. Its totient is φ = 331618680.

The previous prime is 664271681. The next prime is 664271747. The reversal of 664271726 is 627172466.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256985 + ... + 259556.

It is an arithmetic number, because the mean of its divisors is an integer number (124744893).

Almost surely, 2^664271726 is an apocalyptic number.

664271726 is a deficient number, since it is larger than the sum of its proper divisors (333687418).

664271726 is a wasteful number, since it uses less digits than its factorization.

664271726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517186.

The product of its digits is 169344, while the sum is 41.

The square root of 664271726 is about 25773.4694210927. The cubic root of 664271726 is about 872.5331228822.

The spelling of 664271726 in words is "six hundred sixty-four million, two hundred seventy-one thousand, seven hundred twenty-six".