78981009 has 8 divisors (see below), whose sum is σ = 107548800. Its totient is φ = 51533616.

The previous prime is 78980939. The next prime is 78981029. The reversal of 78981009 is 90018987.

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

It is not a de Polignac number, because 78981009 - 2¹² = 78976913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78981029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279934 + ... + 280215.

It is an arithmetic number, because the mean of its divisors is an integer number (13443600).

Almost surely, 2^78981009 is an apocalyptic number.

It is an amenable number.

78981009 is a deficient number, since it is larger than the sum of its proper divisors (28567791).

78981009 is a wasteful number, since it uses less digits than its factorization.

78981009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560199.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 78981009 is about 8887.1260258871. The cubic root of 78981009 is about 429.0496570988.

The spelling of 78981009 in words is "seventy-eight million, nine hundred eighty-one thousand, nine".