7678989 has 8 divisors (see below), whose sum is σ = 11376320. Its totient is φ = 5119308.

The previous prime is 7678967. The next prime is 7678999. The reversal of 7678989 is 9898767.

7678989 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 7678989 - 2⁷ = 7678861 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7678999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142177 + ... + 142230.

It is an arithmetic number, because the mean of its divisors is an integer number (1422040).

Almost surely, 2^7678989 is an apocalyptic number.

It is an amenable number.

7678989 is a deficient number, since it is larger than the sum of its proper divisors (3697331).

7678989 is a wasteful number, since it uses less digits than its factorization.

7678989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284416 (or 284410 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 7678989 is about 2771.0988795061. The cubic root of 7678989 is about 197.2883081346.

The spelling of 7678989 in words is "seven million, six hundred seventy-eight thousand, nine hundred eighty-nine".