9897128 has 32 divisors (see below), whose sum is σ = 19987560. Its totient is φ = 4577280.

The previous prime is 9897127. The next prime is 9897161. The reversal of 9897128 is 8217989.

It can be written as a sum of positive squares in 4 ways, for example, as 7279204 + 2617924 = 2698^2 + 1618^2 .

It is not an unprimeable number, because it can be changed into a prime (9897127) 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, 7700 + ... + 8892.

Almost surely, 2^9897128 is an apocalyptic number.

It is an amenable number.

9897128 is an abundant number, since it is smaller than the sum of its proper divisors (10090432).

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

9897128 is a wasteful number, since it uses less digits than its factorization.

9897128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277 (or 1273 counting only the distinct ones).

The product of its digits is 72576, while the sum is 44.

The square root of 9897128 is about 3145.9701206464. The cubic root of 9897128 is about 214.7021511153.

The spelling of 9897128 in words is "nine million, eight hundred ninety-seven thousand, one hundred twenty-eight".