744643387 has 4 divisors (see below), whose sum is σ = 744714936. Its totient is φ = 744571840.

The previous prime is 744643369. The next prime is 744643391. The reversal of 744643387 is 783346447.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 744643387 - 2⁷ = 744643259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (744643327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16813 + ... + 42094.

It is an arithmetic number, because the mean of its divisors is an integer number (186178734).

Almost surely, 2^744643387 is an apocalyptic number.

744643387 is a deficient number, since it is larger than the sum of its proper divisors (71549).

744643387 is a wasteful number, since it uses less digits than its factorization.

744643387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71548.

The product of its digits is 1354752, while the sum is 46.

The square root of 744643387 is about 27288.1547012619. The cubic root of 744643387 is about 906.3921014935.

The spelling of 744643387 in words is "seven hundred forty-four million, six hundred forty-three thousand, three hundred eighty-seven".