9640728 has 32 divisors (see below), whose sum is σ = 26780400. Its totient is φ = 3213504.

The previous prime is 9640727. The next prime is 9640739. The reversal of 9640728 is 8270469.

9640728 is a `hidden beast` number, since 9 + 640 + 7 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 9640692 and 9640701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9640727) 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, 22101 + ... + 22532.

Almost surely, 2^9640728 is an apocalyptic number.

It is an amenable number.

9640728 is an abundant number, since it is smaller than the sum of its proper divisors (17139672).

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

9640728 is a wasteful number, since it uses less digits than its factorization.

9640728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44648 (or 44638 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 9640728 is about 3104.9521735447. The cubic root of 9640728 is about 212.8318450656.

The spelling of 9640728 in words is "nine million, six hundred forty thousand, seven hundred twenty-eight".