618628 has 12 divisors (see below), whose sum is σ = 1120140. Its totient is φ = 298592.

The previous prime is 618619. The next prime is 618637. The reversal of 618628 is 826816.

It is an interprime number because it is at equal distance from previous prime (618619) and next prime (618637).

It can be written as a sum of positive squares in 2 ways, for example, as 521284 + 97344 = 722^2 + 312^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 618628.

It is an unprimeable number.

618628 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 2551 + ... + 2782.

It is an arithmetic number, because the mean of its divisors is an integer number (93345).

2⁶¹⁸⁶²⁸ is an apocalyptic number.

It is an amenable number.

618628 is a deficient number, since it is larger than the sum of its proper divisors (501512).

618628 is a wasteful number, since it uses less digits than its factorization.

618628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5366 (or 5364 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 618628 is about 786.5290840141. The cubic root of 618628 is about 85.2072451537.

The spelling of 618628 in words is "six hundred eighteen thousand, six hundred twenty-eight".