6428645 has 8 divisors (see below), whose sum is σ = 7733880. Its totient is φ = 5129920.

The previous prime is 6428627. The next prime is 6428647. The reversal of 6428645 is 5468246.

It can be written as a sum of positive squares in 4 ways, for example, as 543169 + 5885476 = 737^2 + 2426^2 .

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

It is not a de Polignac number, because 6428645 - 2¹⁴ = 6412261 is a prime.

It is a d-powerful number, because it can be written as 6³ + 4⁵ + 2⁵ + 8 + 6⁷ + 4¹¹ + 5⁹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6428647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 911 + ... + 3699.

It is an arithmetic number, because the mean of its divisors is an integer number (966735).

Almost surely, 2^6428645 is an apocalyptic number.

It is an amenable number.

6428645 is a deficient number, since it is larger than the sum of its proper divisors (1305235).

6428645 is a wasteful number, since it uses less digits than its factorization.

6428645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3255.

The product of its digits is 46080, while the sum is 35.

The square root of 6428645 is about 2535.4772726254. The cubic root of 6428645 is about 185.9401375941.

The spelling of 6428645 in words is "six million, four hundred twenty-eight thousand, six hundred forty-five".