621128 has 8 divisors (see below), whose sum is σ = 1164630. Its totient is φ = 310560.

The previous prime is 621113. The next prime is 621133. The reversal of 621128 is 821126.

It can be written as a sum of positive squares in only one way, i.e., 611524 + 9604 = 782^2 + 98^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

621128 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38813 + ... + 38828.

2⁶²¹¹²⁸ is an apocalyptic number.

It is an amenable number.

621128 is a deficient number, since it is larger than the sum of its proper divisors (543502).

621128 is a wasteful number, since it uses less digits than its factorization.

621128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77647 (or 77643 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 621128 is about 788.1167426213. The cubic root of 621128 is about 85.3218707477.

The spelling of 621128 in words is "six hundred twenty-one thousand, one hundred twenty-eight".