7828385 has 8 divisors (see below), whose sum is σ = 9491496. Its totient is φ = 6197760.

The previous prime is 7828369. The next prime is 7828391. The reversal of 7828385 is 5838287.

7828385 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 4 ways, for example, as 478864 + 7349521 = 692^2 + 2711^2 .

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

It is not a de Polignac number, because 7828385 - 2⁴ = 7828369 is a prime.

It is a super-2 number, since 2×7828385² = 122567223416450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7586 + ... + 8555.

It is an arithmetic number, because the mean of its divisors is an integer number (1186437).

Almost surely, 2^7828385 is an apocalyptic number.

It is an amenable number.

7828385 is a deficient number, since it is larger than the sum of its proper divisors (1663111).

7828385 is a wasteful number, since it uses less digits than its factorization.

7828385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16243.

The product of its digits is 107520, while the sum is 41.

The square root of 7828385 is about 2797.9251240875. The cubic root of 7828385 is about 198.5595250677.

The spelling of 7828385 in words is "seven million, eight hundred twenty-eight thousand, three hundred eighty-five".