749646638 has 16 divisors (see below), whose sum is σ = 1211804496. Its totient is φ = 345751680.

The previous prime is 749646631. The next prime is 749646673. The reversal of 749646638 is 836646947.

It is a self number, because there is not a number n which added to its sum of digits gives 749646638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (749646631) 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, 31670 + ... + 50022.

It is an arithmetic number, because the mean of its divisors is an integer number (75737781).

Almost surely, 2^749646638 is an apocalyptic number.

749646638 is a deficient number, since it is larger than the sum of its proper divisors (462157858).

749646638 is a wasteful number, since it uses less digits than its factorization.

749646638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19939.

The product of its digits is 5225472, while the sum is 53.

The square root of 749646638 is about 27379.6756372314. The cubic root of 749646638 is about 908.4175848082.

The spelling of 749646638 in words is "seven hundred forty-nine million, six hundred forty-six thousand, six hundred thirty-eight".