9928396864 has 28 divisors (see below), whose sum is σ = 19833907500. Its totient is φ = 4930876928.

The previous prime is 9928396853. The next prime is 9928396883. The reversal of 9928396864 is 4686938299.

It can be written as a sum of positive squares in 2 ways, for example, as 316555264 + 9611841600 = 17792^2 + 98040^2 .

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a junction number, because it is equal to n+sod(n) for n = 9928396796 and 9928396805.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511039 + ... + 530110.

Almost surely, 2^9928396864 is an apocalyptic number.

It is an amenable number.

9928396864 is a deficient number, since it is larger than the sum of its proper divisors (9905510636).

9928396864 is a wasteful number, since it uses less digits than its factorization.

9928396864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041310 (or 1041300 counting only the distinct ones).

The product of its digits is 40310784, while the sum is 64.

The square root of 9928396864 is about 99641.3411391075. The cubic root of 9928396864 is about 2149.2802251872.

The spelling of 9928396864 in words is "nine billion, nine hundred twenty-eight million, three hundred ninety-six thousand, eight hundred sixty-four".