890728 has 8 divisors (see below), whose sum is σ = 1670130. Its totient is φ = 445360.

The previous prime is 890717. The next prime is 890737. The reversal of 890728 is 827098.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 887364 + 3364 = 942^2 + 58^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 890693 and 890702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55663 + ... + 55678.

2⁸⁹⁰⁷²⁸ is an apocalyptic number.

It is an amenable number.

890728 is a deficient number, since it is larger than the sum of its proper divisors (779402).

890728 is a wasteful number, since it uses less digits than its factorization.

890728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111347 (or 111343 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 890728 is about 943.7838735643. The cubic root of 890728 is about 96.2162371038.

The spelling of 890728 in words is "eight hundred ninety thousand, seven hundred twenty-eight".