840628 has 6 divisors (see below), whose sum is σ = 1471106. Its totient is φ = 420312.

The previous prime is 840611. The next prime is 840643. The reversal of 840628 is 826048.

It can be written as a sum of positive squares in only one way, i.e., 702244 + 138384 = 838^2 + 372^2 .

It is a junction number, because it is equal to n+sod(n) for n = 840596 and 840605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105075 + ... + 105082.

2⁸⁴⁰⁶²⁸ is an apocalyptic number.

It is an amenable number.

840628 is a deficient number, since it is larger than the sum of its proper divisors (630478).

840628 is a wasteful number, since it uses less digits than its factorization.

840628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210161 (or 210159 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 840628 is about 916.8576770688. The cubic root of 840628 is about 94.3773873349.

The spelling of 840628 in words is "eight hundred forty thousand, six hundred twenty-eight".