628190681 has 8 divisors (see below), whose sum is σ = 667033704. Its totient is φ = 589557760.

The previous prime is 628190669. The next prime is 628190683. The reversal of 628190681 is 186091826.

It can be written as a sum of positive squares in 4 ways, for example, as 89208025 + 538982656 = 9445^2 + 23216^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 628190681 - 2¹⁰ = 628189657 is a prime.

It is a super-2 number, since 2×628190681² = 789247063390487522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628190683) 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, 46340 + ... + 58341.

It is an arithmetic number, because the mean of its divisors is an integer number (83379213).

Almost surely, 2^628190681 is an apocalyptic number.

It is an amenable number.

628190681 is a deficient number, since it is larger than the sum of its proper divisors (38843023).

628190681 is a wasteful number, since it uses less digits than its factorization.

628190681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105051.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 628190681 is about 25063.7323836654. The cubic root of 628190681 is about 856.4404345573.

The spelling of 628190681 in words is "six hundred twenty-eight million, one hundred ninety thousand, six hundred eighty-one".