745138646 has 16 divisors (see below), whose sum is σ = 1284003744. Its totient is φ = 317689344.

The previous prime is 745138609. The next prime is 745138649. The reversal of 745138646 is 646831547.

It is a junction number, because it is equal to n+sod(n) for n = 745138597 and 745138606.

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, 135185 + ... + 140588.

It is an arithmetic number, because the mean of its divisors is an integer number (80250234).

Almost surely, 2^745138646 is an apocalyptic number.

745138646 is a deficient number, since it is larger than the sum of its proper divisors (538865098).

745138646 is a wasteful number, since it uses less digits than its factorization.

745138646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275975.

The product of its digits is 483840, while the sum is 44.

The square root of 745138646 is about 27297.2278079661. The cubic root of 745138646 is about 906.5930027438.

The spelling of 745138646 in words is "seven hundred forty-five million, one hundred thirty-eight thousand, six hundred forty-six".