7878789 has 12 divisors (see below), whose sum is σ = 11802336. Its totient is φ = 5252364.

The previous prime is 7878763. The next prime is 7878791. The reversal of 7878789 is 9878787.

7878789 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 7878789 - 2²¹ = 5781637 is a prime.

It is a super-2 number, since 2×7878789² = 124150632213042, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15969 + ... + 16454.

It is an arithmetic number, because the mean of its divisors is an integer number (983528).

Almost surely, 2^7878789 is an apocalyptic number.

It is an amenable number.

7878789 is a deficient number, since it is larger than the sum of its proper divisors (3923547).

7878789 is an equidigital number, since it uses as much as digits as its factorization.

7878789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32438 (or 32426 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 54.

The square root of 7878789 is about 2806.9180607919. The cubic root of 7878789 is about 198.9847635279.

The spelling of 7878789 in words is "seven million, eight hundred seventy-eight thousand, seven hundred eighty-nine".