9728420 has 96 divisors (see below), whose sum is σ = 24385536. Its totient is φ = 3225600.

The previous prime is 9728419. The next prime is 9728423. The reversal of 9728420 is 248279.

9728420 = T₇₉ + T₈₀ + ... + T₃₈₈.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9728423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136985 + ... + 137055.

It is an arithmetic number, because the mean of its divisors is an integer number (254016).

Almost surely, 2^9728420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9728420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12192768).

9728420 is an abundant number, since it is smaller than the sum of its proper divisors (14657116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9728420 is a wasteful number, since it uses less digits than its factorization.

9728420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 9728420 is about 3119.0415194415. The cubic root of 9728420 is about 213.4752040265.

The spelling of 9728420 in words is "nine million, seven hundred twenty-eight thousand, four hundred twenty".