744436645 has 4 divisors (see below), whose sum is σ = 893323980. Its totient is φ = 595549312.

The previous prime is 744436639. The next prime is 744436661. The reversal of 744436645 is 546634447.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546634447 = 43 ⋅12712429.

It can be written as a sum of positive squares in 2 ways, for example, as 140161921 + 604274724 = 11839^2 + 24582^2 .

It is a cyclic number.

It is not a de Polignac number, because 744436645 - 2¹¹ = 744434597 is a prime.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 74443660 + ... + 74443669.

It is an arithmetic number, because the mean of its divisors is an integer number (223330995).

Almost surely, 2^744436645 is an apocalyptic number.

It is an amenable number.

744436645 is a deficient number, since it is larger than the sum of its proper divisors (148887335).

744436645 is a wasteful number, since it uses less digits than its factorization.

744436645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148887334.

The product of its digits is 967680, while the sum is 43.

The square root of 744436645 is about 27284.3663111314. The cubic root of 744436645 is about 906.3082104821.

The spelling of 744436645 in words is "seven hundred forty-four million, four hundred thirty-six thousand, six hundred forty-five".