745660321 has 8 divisors (see below), whose sum is σ = 852436224. Its totient is φ = 638947680.

The previous prime is 745660277. The next prime is 745660351. The reversal of 745660321 is 123066547.

It is a happy number.

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

It is not a de Polignac number, because 745660321 - 2⁷ = 745660193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745660351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12936 + ... + 40726.

It is an arithmetic number, because the mean of its divisors is an integer number (106554528).

Almost surely, 2^745660321 is an apocalyptic number.

It is an amenable number.

745660321 is a deficient number, since it is larger than the sum of its proper divisors (106775903).

745660321 is a wasteful number, since it uses less digits than its factorization.

745660321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31631.

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

The square root of 745660321 is about 27306.7815935895. The cubic root of 745660321 is about 906.8045233690.

The spelling of 745660321 in words is "seven hundred forty-five million, six hundred sixty thousand, three hundred twenty-one".