7989678 has 40 divisors (see below), whose sum is σ = 18077400. Its totient is φ = 2637360.

The previous prime is 7989649. The next prime is 7989679. The reversal of 7989678 is 8769897.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7989679) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23973 + ... + 24303.

It is an arithmetic number, because the mean of its divisors is an integer number (451935).

Almost surely, 2^7989678 is an apocalyptic number.

7989678 is the 1788-th heptagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7989678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9038700).

7989678 is an abundant number, since it is smaller than the sum of its proper divisors (10087722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7989678 is a wasteful number, since it uses less digits than its factorization.

7989678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 485 counting only the distinct ones).

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

The square root of 7989678 is about 2826.6018467411. The cubic root of 7989678 is about 199.9139463125.

The spelling of 7989678 in words is "seven million, nine hundred eighty-nine thousand, six hundred seventy-eight".