745138645 has 8 divisors (see below), whose sum is σ = 946764504. Its totient is φ = 561045504.

The previous prime is 745138609. The next prime is 745138649. The reversal of 745138645 is 546831547.

It can be written as a sum of positive squares in 4 ways, for example, as 35129329 + 710009316 = 5927^2 + 26646^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 745138645 - 2⁹ = 745138133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745138649) 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, 4383084 + ... + 4383253.

It is an arithmetic number, because the mean of its divisors is an integer number (118345563).

Almost surely, 2^745138645 is an apocalyptic number.

It is an amenable number.

745138645 is a deficient number, since it is larger than the sum of its proper divisors (201625859).

745138645 is a wasteful number, since it uses less digits than its factorization.

745138645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8766359.

The product of its digits is 403200, while the sum is 43.

The square root of 745138645 is about 27297.2277896493. The cubic root of 745138645 is about 906.5930023382.

The spelling of 745138645 in words is "seven hundred forty-five million, one hundred thirty-eight thousand, six hundred forty-five".