9777728 has 14 divisors (see below), whose sum is σ = 19402806. Its totient is φ = 4888832.

The previous prime is 9777707. The next prime is 9777749. The reversal of 9777728 is 8277779.

It is an interprime number because it is at equal distance from previous prime (9777707) and next prime (9777749).

It can be written as a sum of positive squares in only one way, i.e., 7795264 + 1982464 = 2792^2 + 1408^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76325 + ... + 76452.

Almost surely, 2^9777728 is an apocalyptic number.

It is an amenable number.

9777728 is a deficient number, since it is larger than the sum of its proper divisors (9625078).

9777728 is a wasteful number, since it uses less digits than its factorization.

9777728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152789 (or 152779 counting only the distinct ones).

The product of its digits is 345744, while the sum is 47.

The square root of 9777728 is about 3126.9358803787. The cubic root of 9777728 is about 213.8352591265.

The spelling of 9777728 in words is "nine million, seven hundred seventy-seven thousand, seven hundred twenty-eight".