9978784 has 24 divisors (see below), whose sum is σ = 20325060. Its totient is φ = 4816896.

The previous prime is 9978767. The next prime is 9978791. The reversal of 9978784 is 4878799.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9168784 + 810000 = 3028^2 + 900^2 .

It is a super-2 number, since 2×9978784² = 199152260237312, which contains 22 as substring.

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, 4449 + ... + 6304.

Almost surely, 2^9978784 is an apocalyptic number.

It is an amenable number.

9978784 is an abundant number, since it is smaller than the sum of its proper divisors (10346276).

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

9978784 is a wasteful number, since it uses less digits than its factorization.

9978784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10792 (or 10784 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 52.

The square root of 9978784 is about 3158.9213348863. The cubic root of 9978784 is about 215.2909995046.

The spelling of 9978784 in words is "nine million, nine hundred seventy-eight thousand, seven hundred eighty-four".