978688 has 18 divisors (see below), whose sum is σ = 1954064. Its totient is φ = 489216.

The previous prime is 978683. The next prime is 978689. The reversal of 978688 is 886879.

978688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1656 + ... + 2167.

2⁹⁷⁸⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

978688 is a deficient number, since it is larger than the sum of its proper divisors (975376).

978688 is an equidigital number, since it uses as much as digits as its factorization.

978688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3839 (or 3825 counting only the distinct ones).

The product of its digits is 193536, while the sum is 46.

The square root of 978688 is about 989.2866116551. The cubic root of 978688 is about 99.2844927032.

Subtracting from 978688 its reverse (886879), we obtain a square (91809 = 303²).

It can be divided in two parts, 9786 and 88, that multiplied together give a palindrome (861168).

The spelling of 978688 in words is "nine hundred seventy-eight thousand, six hundred eighty-eight".