978209679 has 8 divisors (see below), whose sum is σ = 1320789760. Its totient is φ = 643884696.

The previous prime is 978209677. The next prime is 978209689. The reversal of 978209679 is 976902879.

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

It is not a de Polignac number, because 978209679 - 2¹ = 978209677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978209677) 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, 2063497 + ... + 2063970.

It is an arithmetic number, because the mean of its divisors is an integer number (165098720).

Almost surely, 2^978209679 is an apocalyptic number.

978209679 is a deficient number, since it is larger than the sum of its proper divisors (342580081).

978209679 is a wasteful number, since it uses less digits than its factorization.

978209679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4127549.

The product of its (nonzero) digits is 3429216, while the sum is 57.

The square root of 978209679 is about 31276.3437601009. The cubic root of 978209679 is about 992.6831540035.

The spelling of 978209679 in words is "nine hundred seventy-eight million, two hundred nine thousand, six hundred seventy-nine".