9938690644 has 12 divisors (see below), whose sum is σ = 17953763968. Its totient is φ = 4809043800.

The previous prime is 9938690621. The next prime is 9938690647. The reversal of 9938690644 is 4460968399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9938690647) 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, 40075242 + ... + 40075489.

Almost surely, 2^9938690644 is an apocalyptic number.

It is an amenable number.

9938690644 is a deficient number, since it is larger than the sum of its proper divisors (8015073324).

9938690644 is a wasteful number, since it uses less digits than its factorization.

9938690644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80150766 (or 80150764 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 58.

The square root of 9938690644 is about 99692.9819194912. The cubic root of 9938690644 is about 2150.0227611796.

The spelling of 9938690644 in words is "nine billion, nine hundred thirty-eight million, six hundred ninety thousand, six hundred forty-four".