728578 has 4 divisors (see below), whose sum is σ = 1092870. Its totient is φ = 364288.

The previous prime is 728573. The next prime is 728579. The reversal of 728578 is 875827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 875827 = 37 ⋅23671.

It can be written as a sum of positive squares in only one way, i.e., 558009 + 170569 = 747^2 + 413^2 .

It is not an unprimeable number, because it can be changed into a prime (728573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182143 + ... + 182146.

2⁷²⁸⁵⁷⁸ is an apocalyptic number.

728578 is a deficient number, since it is larger than the sum of its proper divisors (364292).

728578 is a wasteful number, since it uses less digits than its factorization.

728578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364291.

The product of its digits is 31360, while the sum is 37.

The square root of 728578 is about 853.5678063282. The cubic root of 728578 is about 89.9826303928.

The spelling of 728578 in words is "seven hundred twenty-eight thousand, five hundred seventy-eight".