981728 has 24 divisors (see below), whose sum is σ = 2109240. Its totient is φ = 446080.

The previous prime is 981713. The next prime is 981731. The reversal of 981728 is 827189.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 981728.

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, 1043 + ... + 1746.

It is an arithmetic number, because the mean of its divisors is an integer number (87885).

2⁹⁸¹⁷²⁸ is an apocalyptic number.

It is an amenable number.

981728 is an abundant number, since it is smaller than the sum of its proper divisors (1127512).

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

981728 is a wasteful number, since it uses less digits than its factorization.

981728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810 (or 2802 counting only the distinct ones).

The product of its digits is 8064, while the sum is 35.

The square root of 981728 is about 990.8218810664. The cubic root of 981728 is about 99.3871855896.

The spelling of 981728 in words is "nine hundred eighty-one thousand, seven hundred twenty-eight".