628739 has 4 divisors (see below), whose sum is σ = 640656. Its totient is φ = 616824.

The previous prime is 628721. The next prime is 628753. The reversal of 628739 is 937826.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 937826 = 2 ⋅468913.

It is a cyclic number.

It is not a de Polignac number, because 628739 - 2¹² = 624643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 628699 and 628708.

It is not an unprimeable number, because it can be changed into a prime (628709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5879 + ... + 5984.

It is an arithmetic number, because the mean of its divisors is an integer number (160164).

2⁶²⁸⁷³⁹ is an apocalyptic number.

628739 is a deficient number, since it is larger than the sum of its proper divisors (11917).

628739 is a wasteful number, since it uses less digits than its factorization.

628739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11916.

The product of its digits is 18144, while the sum is 35.

The square root of 628739 is about 792.9306400941. The cubic root of 628739 is about 85.6689544693.

The spelling of 628739 in words is "six hundred twenty-eight thousand, seven hundred thirty-nine".