745666 has 4 divisors (see below), whose sum is σ = 1118502. Its totient is φ = 372832.

The previous prime is 745649. The next prime is 745673. The reversal of 745666 is 666547.

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., 731025 + 14641 = 855^2 + 121^2 .

It is a d-powerful number, because it can be written as 7⁶ + 4⁹ + 6² + 5⁷ + 6⁵ + 6⁷ .

It is an unprimeable number.

745666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 186415 + ... + 186418.

2⁷⁴⁵⁶⁶⁶ is an apocalyptic number.

745666 is a deficient number, since it is larger than the sum of its proper divisors (372836).

745666 is a wasteful number, since it uses less digits than its factorization.

745666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372835.

The product of its digits is 30240, while the sum is 34.

The square root of 745666 is about 863.5195423382. The cubic root of 745666 is about 90.6806825458.

The spelling of 745666 in words is "seven hundred forty-five thousand, six hundred sixty-six".