724666 has 4 divisors (see below), whose sum is σ = 1087002. Its totient is φ = 362332.

The previous prime is 724651. The next prime is 724721. The reversal of 724666 is 666427.

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., 674041 + 50625 = 821^2 + 225^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 181165 + ... + 181168.

2⁷²⁴⁶⁶⁶ is an apocalyptic number.

724666 is a deficient number, since it is larger than the sum of its proper divisors (362336).

724666 is a wasteful number, since it uses less digits than its factorization.

724666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362335.

The product of its digits is 12096, while the sum is 31.

The square root of 724666 is about 851.2731641489. The cubic root of 724666 is about 89.8212914728.

The spelling of 724666 in words is "seven hundred twenty-four thousand, six hundred sixty-six".