728890 has 8 divisors (see below), whose sum is σ = 1312020. Its totient is φ = 291552.

The previous prime is 728881. The next prime is 728891. The reversal of 728890 is 98827.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 707281 + 21609 = 841^2 + 147^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (728891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36435 + ... + 36454.

2⁷²⁸⁸⁹⁰ is an apocalyptic number.

728890 is a deficient number, since it is larger than the sum of its proper divisors (583130).

728890 is a wasteful number, since it uses less digits than its factorization.

728890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72896.

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

The square root of 728890 is about 853.7505490481. The cubic root of 728890 is about 89.9954730233.

The spelling of 728890 in words is "seven hundred twenty-eight thousand, eight hundred ninety".