6428249 has 4 divisors (see below), whose sum is σ = 6443940. Its totient is φ = 6412560.

The previous prime is 6428207. The next prime is 6428263. The reversal of 6428249 is 9428246.

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 990025 + 5438224 = 995^2 + 2332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6428249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6421249) 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, 7214 + ... + 8055.

It is an arithmetic number, because the mean of its divisors is an integer number (1610985).

Almost surely, 2^6428249 is an apocalyptic number.

It is an amenable number.

6428249 is a deficient number, since it is larger than the sum of its proper divisors (15691).

6428249 is a wasteful number, since it uses less digits than its factorization.

6428249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15690.

The product of its digits is 27648, while the sum is 35.

The square root of 6428249 is about 2535.3991796165. The cubic root of 6428249 is about 185.9363195886.

The spelling of 6428249 in words is "six million, four hundred twenty-eight thousand, two hundred forty-nine".