78006789 has 24 divisors (see below), whose sum is σ = 129359360. Its totient is φ = 44372448.

The previous prime is 78006763. The next prime is 78006811. The reversal of 78006789 is 98760087.

It is not a de Polignac number, because 78006789 - 2¹¹ = 78004741 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 (78006689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11724 + ... + 17130.

Almost surely, 2^78006789 is an apocalyptic number.

It is an amenable number.

78006789 is a deficient number, since it is larger than the sum of its proper divisors (51352571).

78006789 is a wasteful number, since it uses less digits than its factorization.

78006789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5649 (or 5646 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 78006789 is about 8832.1452094041. The cubic root of 78006789 is about 427.2782639981.

The spelling of 78006789 in words is "seventy-eight million, six thousand, seven hundred eighty-nine".