977728 has 14 divisors (see below), whose sum is σ = 1940306. Its totient is φ = 488832.

The previous prime is 977723. The next prime is 977747. The reversal of 977728 is 827779.

977728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 627264 + 350464 = 792^2 + 592^2 .

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7575 + ... + 7702.

2⁹⁷⁷⁷²⁸ is an apocalyptic number.

It is an amenable number.

977728 is a deficient number, since it is larger than the sum of its proper divisors (962578).

977728 is a wasteful number, since it uses less digits than its factorization.

977728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15289 (or 15279 counting only the distinct ones).

The product of its digits is 49392, while the sum is 40.

The square root of 977728 is about 988.8012944975. The cubic root of 977728 is about 99.2520191964.

The spelling of 977728 in words is "nine hundred seventy-seven thousand, seven hundred twenty-eight".