78906789 has 24 divisors (see below), whose sum is σ = 123326112. Its totient is φ = 48327840.

The previous prime is 78906781. The next prime is 78906797. The reversal of 78906789 is 98760987.

It is an interprime number because it is at equal distance from previous prime (78906781) and next prime (78906797).

It is not a de Polignac number, because 78906789 - 2³ = 78906781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78906781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25074 + ... + 28044.

It is an arithmetic number, because the mean of its divisors is an integer number (5138588).

Almost surely, 2^78906789 is an apocalyptic number.

It is an amenable number.

78906789 is a deficient number, since it is larger than the sum of its proper divisors (44419323).

78906789 is a wasteful number, since it uses less digits than its factorization.

78906789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217 (or 3214 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 78906789 is about 8882.9493412943. The cubic root of 78906789 is about 428.9152195254.

The spelling of 78906789 in words is "seventy-eight million, nine hundred six thousand, seven hundred eighty-nine".