728626 has 4 divisors (see below), whose sum is σ = 1092942. Its totient is φ = 364312.

The previous prime is 728579. The next prime is 728627. The reversal of 728626 is 626827.

It is a happy number.

728626 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 626827 = 89 ⋅7043.

It can be written as a sum of positive squares in only one way, i.e., 641601 + 87025 = 801^2 + 295^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (728627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182155 + ... + 182158.

2⁷²⁸⁶²⁶ is an apocalyptic number.

728626 is a deficient number, since it is larger than the sum of its proper divisors (364316).

728626 is a wasteful number, since it uses less digits than its factorization.

728626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364315.

The product of its digits is 8064, while the sum is 31.

The square root of 728626 is about 853.5959231393. The cubic root of 728626 is about 89.9846064207.

The spelling of 728626 in words is "seven hundred twenty-eight thousand, six hundred twenty-six".