978835681 has 8 divisors (see below), whose sum is σ = 1006289928. Its totient is φ = 951552000.

The previous prime is 978835667. The next prime is 978835687. The reversal of 978835681 is 186538879.

It can be written as a sum of positive squares in 4 ways, for example, as 91987281 + 886848400 = 9591^2 + 29780^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978835681 is a prime.

It is a super-2 number, since 2×978835681² = 1916238580797467522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978835687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30960 + ... + 54001.

It is an arithmetic number, because the mean of its divisors is an integer number (125786241).

Almost surely, 2^978835681 is an apocalyptic number.

It is an amenable number.

978835681 is a deficient number, since it is larger than the sum of its proper divisors (27454247).

978835681 is a wasteful number, since it uses less digits than its factorization.

978835681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85283.

The product of its digits is 2903040, while the sum is 55.

The square root of 978835681 is about 31286.3497551248. The cubic root of 978835681 is about 992.8948635995.

The spelling of 978835681 in words is "nine hundred seventy-eight million, eight hundred thirty-five thousand, six hundred eighty-one".