9728899658 has 16 divisors (see below), whose sum is σ = 14991086184. Its totient is φ = 4731929280.

The previous prime is 9728899603. The next prime is 9728899667. The reversal of 9728899658 is 8569988279.

It can be written as a sum of positive squares in 4 ways, for example, as 6354800089 + 3374099569 = 79717^2 + 58087^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9728899591 and 9728899600.

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, 401216 + ... + 424772.

Almost surely, 2^9728899658 is an apocalyptic number.

9728899658 is a deficient number, since it is larger than the sum of its proper divisors (5262186526).

9728899658 is a wasteful number, since it uses less digits than its factorization.

9728899658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29177.

The product of its digits is 156764160, while the sum is 71.

The square root of 9728899658 is about 98635.1846857905. The cubic root of 9728899658 is about 2134.7871242103.

The spelling of 9728899658 in words is "nine billion, seven hundred twenty-eight million, eight hundred ninety-nine thousand, six hundred fifty-eight".