6428186645 has 8 divisors (see below), whose sum is σ = 7715775960. Its totient is φ = 5141248000.

The previous prime is 6428186581. The next prime is 6428186651. The reversal of 6428186645 is 5466818246.

It can be written as a sum of positive squares in 4 ways, for example, as 171060241 + 6257126404 = 13079^2 + 79102^2 .

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

It is not a de Polignac number, because 6428186645 - 2⁶ = 6428186581 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6428186593 and 6428186602.

It is a congruent number.

It is an unprimeable number.

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, 140660 + ... + 180669.

It is an arithmetic number, because the mean of its divisors is an integer number (964471995).

Almost surely, 2^6428186645 is an apocalyptic number.

It is an amenable number.

6428186645 is a deficient number, since it is larger than the sum of its proper divisors (1287589315).

6428186645 is a wasteful number, since it uses less digits than its factorization.

6428186645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325335.

The product of its digits is 2211840, while the sum is 50.

The square root of 6428186645 is about 80175.9729906660. The cubic root of 6428186645 is about 1859.3571838304.

The spelling of 6428186645 in words is "six billion, four hundred twenty-eight million, one hundred eighty-six thousand, six hundred forty-five".