628685239 has 54 divisors (see below), whose sum is σ = 828638640. Its totient is φ = 475282080.

The previous prime is 628685237. The next prime is 628685251. The reversal of 628685239 is 932586826.

It is not a de Polignac number, because 628685239 - 2¹ = 628685237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 628685192 and 628685201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628685237) 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 53 ways as a sum of consecutive naturals, for example, 7958002 + ... + 7958080.

It is an arithmetic number, because the mean of its divisors is an integer number (15345160).

Almost surely, 2^628685239 is an apocalyptic number.

628685239 is a deficient number, since it is larger than the sum of its proper divisors (199953401).

628685239 is a wasteful number, since it uses less digits than its factorization.

628685239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 130 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

The square root of 628685239 is about 25073.5964512473. The cubic root of 628685239 is about 856.6651266120.

The spelling of 628685239 in words is "six hundred twenty-eight million, six hundred eighty-five thousand, two hundred thirty-nine".