628825021 has 12 divisors (see below), whose sum is σ = 696481632. Its totient is φ = 567281000.

The previous prime is 628824997. The next prime is 628825039. The reversal of 628825021 is 120528826.

It is not a de Polignac number, because 628825021 - 2¹¹ = 628822973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628825081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3985 + ... + 35686.

It is an arithmetic number, because the mean of its divisors is an integer number (58040136).

Almost surely, 2^628825021 is an apocalyptic number.

It is an amenable number.

628825021 is a deficient number, since it is larger than the sum of its proper divisors (67656611).

628825021 is a wasteful number, since it uses less digits than its factorization.

628825021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39824 (or 39813 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 628825021 is about 25076.3837305143. The cubic root of 628825021 is about 856.7286122715.

The spelling of 628825021 in words is "six hundred twenty-eight million, eight hundred twenty-five thousand, twenty-one".