7828215 has 8 divisors (see below), whose sum is σ = 12525168. Its totient is φ = 4175040.

The previous prime is 7828199. The next prime is 7828217. The reversal of 7828215 is 5128287.

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

It is not a de Polignac number, because 7828215 - 2⁴ = 7828199 is a prime.

It is a super-2 number, since 2×7828215² = 122561900172450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

7828215 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7828217) 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, 260926 + ... + 260955.

It is an arithmetic number, because the mean of its divisors is an integer number (1565646).

Almost surely, 2^7828215 is an apocalyptic number.

7828215 is a deficient number, since it is larger than the sum of its proper divisors (4696953).

7828215 is a wasteful number, since it uses less digits than its factorization.

7828215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521889.

The product of its digits is 8960, while the sum is 33.

The square root of 7828215 is about 2797.8947442676. The cubic root of 7828215 is about 198.5580877613.

The spelling of 7828215 in words is "seven million, eight hundred twenty-eight thousand, two hundred fifteen".