9721733428 has 24 divisors (see below), whose sum is σ = 18608163840. Its totient is φ = 4407424320.

The previous prime is 9721733381. The next prime is 9721733431. The reversal of 9721733428 is 8243371279.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271593 + ... + 305296.

It is an arithmetic number, because the mean of its divisors is an integer number (775340160).

Almost surely, 2^9721733428 is an apocalyptic number.

It is an amenable number.

9721733428 is a deficient number, since it is larger than the sum of its proper divisors (8886430412).

9721733428 is a wasteful number, since it uses less digits than its factorization.

9721733428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577287 (or 577285 counting only the distinct ones).

The product of its digits is 508032, while the sum is 46.

The square root of 9721733428 is about 98598.8510480726. The cubic root of 9721733428 is about 2134.2628397304.

The spelling of 9721733428 in words is "nine billion, seven hundred twenty-one million, seven hundred thirty-three thousand, four hundred twenty-eight".