978681 has 16 divisors (see below), whose sum is σ = 1456128. Its totient is φ = 579600.

The previous prime is 978647. The next prime is 978683. The reversal of 978681 is 186879.

It is not a de Polignac number, because 978681 - 2⁶ = 978617 is a prime.

It is a super-2 number, since 2×978681² = 1915632999522, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978681.

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 in 15 ways as a sum of consecutive naturals, for example, 1236 + ... + 1866.

It is an arithmetic number, because the mean of its divisors is an integer number (91008).

2⁹⁷⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

978681 is a deficient number, since it is larger than the sum of its proper divisors (477447).

978681 is a wasteful number, since it uses less digits than its factorization.

978681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692.

The product of its digits is 24192, while the sum is 39.

The square root of 978681 is about 989.2830737458. The cubic root of 978681 is about 99.2842559941.

It can be divided in two parts, 97 and 8681, that added together give a palindrome (8778).

The spelling of 978681 in words is "nine hundred seventy-eight thousand, six hundred eighty-one".