724313666 has 4 divisors (see below), whose sum is σ = 1086470502. Its totient is φ = 362156832.

The previous prime is 724313651. The next prime is 724313669. The reversal of 724313666 is 666313427.

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

It can be written as a sum of positive squares in only one way, i.e., 722803225 + 1510441 = 26885^2 + 1229^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (724313669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181078415 + ... + 181078418.

Almost surely, 2^724313666 is an apocalyptic number.

724313666 is a deficient number, since it is larger than the sum of its proper divisors (362156836).

724313666 is a wasteful number, since it uses less digits than its factorization.

724313666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362156835.

The product of its digits is 108864, while the sum is 38.

The square root of 724313666 is about 26913.0761155242. The cubic root of 724313666 is about 898.0673201813.

The spelling of 724313666 in words is "seven hundred twenty-four million, three hundred thirteen thousand, six hundred sixty-six".