628424 has 8 divisors (see below), whose sum is σ = 1178310. Its totient is φ = 314208.

The previous prime is 628423. The next prime is 628427. The reversal of 628424 is 424826.

It can be written as a sum of positive squares in only one way, i.e., 611524 + 16900 = 782^2 + 130^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 628393 and 628402.

It is not an unprimeable number, because it can be changed into a prime (628423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39269 + ... + 39284.

2⁶²⁸⁴²⁴ is an apocalyptic number.

It is an amenable number.

628424 is a deficient number, since it is larger than the sum of its proper divisors (549886).

628424 is a wasteful number, since it uses less digits than its factorization.

628424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78559 (or 78555 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

The square root of 628424 is about 792.7319849735. The cubic root of 628424 is about 85.6546452840.

The spelling of 628424 in words is "six hundred twenty-eight thousand, four hundred twenty-four".