628819645 has 8 divisors (see below), whose sum is σ = 754769880. Its totient is φ = 502931520.

The previous prime is 628819643. The next prime is 628819651. The reversal of 628819645 is 546918826.

It can be written as a sum of positive squares in 4 ways, for example, as 51811204 + 577008441 = 7198^2 + 24021^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 628819645 - 2¹ = 628819643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628819643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10815 + ... + 37075.

It is an arithmetic number, because the mean of its divisors is an integer number (94346235).

Almost surely, 2^628819645 is an apocalyptic number.

It is an amenable number.

628819645 is a deficient number, since it is larger than the sum of its proper divisors (125950235).

628819645 is a wasteful number, since it uses less digits than its factorization.

628819645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31055.

The product of its digits is 829440, while the sum is 49.

The square root of 628819645 is about 25076.2765377956. The cubic root of 628819645 is about 856.7261707941.

The spelling of 628819645 in words is "six hundred twenty-eight million, eight hundred nineteen thousand, six hundred forty-five".