978646879 has 8 divisors (see below), whose sum is σ = 1124703360. Its totient is φ = 834152856.

The previous prime is 978646861. The next prime is 978646883.

978646879 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 978646879 - 2¹⁷ = 978515807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 978646879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978646829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389269 + ... + 391774.

It is an arithmetic number, because the mean of its divisors is an integer number (140587920).

Almost surely, 2^978646879 is an apocalyptic number.

978646879 is a deficient number, since it is larger than the sum of its proper divisors (146056481).

978646879 is a wasteful number, since it uses less digits than its factorization.

978646879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781229.

The product of its digits is 36578304, while the sum is 64.

The square root of 978646879 is about 31283.3322873379. The cubic root of 978646879 is about 992.8310215629.

It can be divided in two parts, 9786 and 46879, that added together give a palindrome (56665).

The spelling of 978646879 in words is "nine hundred seventy-eight million, six hundred forty-six thousand, eight hundred seventy-nine".