7828789 has 8 divisors (see below), whose sum is σ = 8446680. Its totient is φ = 7228416.

The previous prime is 7828783. The next prime is 7828841. The reversal of 7828789 is 9878287.

7828789 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4695889 + 3132900 = 2167^2 + 1770^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7828789 - 2³ = 7828781 is a prime.

It is a super-2 number, since 2×7828789² = 122579874413042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7828781) 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, 3444 + ... + 5245.

It is an arithmetic number, because the mean of its divisors is an integer number (1055835).

Almost surely, 2^7828789 is an apocalyptic number.

It is an amenable number.

7828789 is a deficient number, since it is larger than the sum of its proper divisors (617891).

7828789 is a wasteful number, since it uses less digits than its factorization.

7828789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8759.

The product of its digits is 451584, while the sum is 49.

The square root of 7828789 is about 2797.9973195127. The cubic root of 7828789 is about 198.5629407006.

The spelling of 7828789 in words is "seven million, eight hundred twenty-eight thousand, seven hundred eighty-nine".