9778728 has 32 divisors (see below), whose sum is σ = 24746400. Its totient is φ = 3219648.

The previous prime is 9778687. The next prime is 9778739. The reversal of 9778728 is 8278779.

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, 463 + ... + 4446.

It is an arithmetic number, because the mean of its divisors is an integer number (773325).

Almost surely, 2^9778728 is an apocalyptic number.

It is an amenable number.

9778728 is an abundant number, since it is smaller than the sum of its proper divisors (14967672).

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

9778728 is a wasteful number, since it uses less digits than its factorization.

9778728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001 (or 4997 counting only the distinct ones).

The product of its digits is 395136, while the sum is 48.

The square root of 9778728 is about 3127.0957772348. The cubic root of 9778728 is about 213.8425487535.

The spelling of 9778728 in words is "nine million, seven hundred seventy-eight thousand, seven hundred twenty-eight".