9988730621 has 8 divisors (see below), whose sum is σ = 10182184800. Its totient is φ = 9796081680.

The previous prime is 9988730611. The next prime is 9988730659. The reversal of 9988730621 is 1260378899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9988730621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988730611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176231 + ... + 225908.

It is an arithmetic number, because the mean of its divisors is an integer number (1272773100).

Almost surely, 2^9988730621 is an apocalyptic number.

It is an amenable number.

9988730621 is a deficient number, since it is larger than the sum of its proper divisors (193454179).

9988730621 is a wasteful number, since it uses less digits than its factorization.

9988730621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402619.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The square root of 9988730621 is about 99943.6372211858. The cubic root of 9988730621 is about 2153.6250811276.

The spelling of 9988730621 in words is "nine billion, nine hundred eighty-eight million, seven hundred thirty thousand, six hundred twenty-one".