78985249689 has 8 divisors (see below), whose sum is σ = 105944287680. Its totient is φ = 52341522416.

The previous prime is 78985249597. The next prime is 78985249727. The reversal of 78985249689 is 98694258987.

It is a happy number.

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 78985249689 - 2⁸ = 78985249433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78985249689.

It is not an unprimeable number, because it can be changed into a prime (78985249589) 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, 78827094 + ... + 78828095.

It is an arithmetic number, because the mean of its divisors is an integer number (13243035960).

Almost surely, 2^78985249689 is an apocalyptic number.

It is an amenable number.

78985249689 is a deficient number, since it is larger than the sum of its proper divisors (26959037991).

78985249689 is a wasteful number, since it uses less digits than its factorization.

78985249689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157655359.

The product of its digits is 627056640, while the sum is 75.

The spelling of 78985249689 in words is "seventy-eight billion, nine hundred eighty-five million, two hundred forty-nine thousand, six hundred eighty-nine".