745668 has 72 divisors (see below), whose sum is σ = 2358720. Its totient is φ = 192960.

The previous prime is 745649. The next prime is 745673. The reversal of 745668 is 866547.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2638 + ... + 2906.

It is an arithmetic number, because the mean of its divisors is an integer number (32760).

2⁷⁴⁵⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 745668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1179360).

745668 is an abundant number, since it is smaller than the sum of its proper divisors (1613052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

745668 is a wasteful number, since it uses less digits than its factorization.

745668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 292 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 745668 is about 863.5207003888. The cubic root of 745668 is about 90.6807636193.

The spelling of 745668 in words is "seven hundred forty-five thousand, six hundred sixty-eight".