290728 has 8 divisors (see below), whose sum is σ = 545130. Its totient is φ = 145360.

The previous prime is 290711. The next prime is 290737. The reversal of 290728 is 827092.

It can be written as a sum of positive squares in only one way, i.e., 213444 + 77284 = 462^2 + 278^2 .

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 = 290696 and 290705.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18163 + ... + 18178.

2²⁹⁰⁷²⁸ is an apocalyptic number.

It is an amenable number.

290728 is a deficient number, since it is larger than the sum of its proper divisors (254402).

290728 is a wasteful number, since it uses less digits than its factorization.

290728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36347 (or 36343 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 290728 is about 539.1919880710. The cubic root of 290728 is about 66.2464006588.

The spelling of 290728 in words is "two hundred ninety thousand, seven hundred twenty-eight".