628187617 has 4 divisors (see below), whose sum is σ = 634663876. Its totient is φ = 621711360.

The previous prime is 628187563. The next prime is 628187639. The reversal of 628187617 is 716781826.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 512388496 + 115799121 = 22636^2 + 10761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628187617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628187657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3237984 + ... + 3238177.

It is an arithmetic number, because the mean of its divisors is an integer number (158665969).

Almost surely, 2^628187617 is an apocalyptic number.

It is an amenable number.

628187617 is a deficient number, since it is larger than the sum of its proper divisors (6476259).

628187617 is an equidigital number, since it uses as much as digits as its factorization.

628187617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6476258.

The product of its digits is 225792, while the sum is 46.

The square root of 628187617 is about 25063.6712594145. The cubic root of 628187617 is about 856.4390421256.

The spelling of 628187617 in words is "six hundred twenty-eight million, one hundred eighty-seven thousand, six hundred seventeen".