744865906 has 4 divisors (see below), whose sum is σ = 1117298862. Its totient is φ = 372432952.

The previous prime is 744865903. The next prime is 744865963. The reversal of 744865906 is 609568447.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 444155625 + 300710281 = 21075^2 + 17341^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 744865906.

It is not an unprimeable number, because it can be changed into a prime (744865903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 186216475 + ... + 186216478.

Almost surely, 2^744865906 is an apocalyptic number.

744865906 is a deficient number, since it is larger than the sum of its proper divisors (372432956).

744865906 is a wasteful number, since it uses less digits than its factorization.

744865906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372432955.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 744865906 is about 27292.2316053488. The cubic root of 744865906 is about 906.4823770898.

The spelling of 744865906 in words is "seven hundred forty-four million, eight hundred sixty-five thousand, nine hundred six".