78432489 has 16 divisors (see below), whose sum is σ = 119338240. Its totient is φ = 50874480.

The previous prime is 78432469. The next prime is 78432499. The reversal of 78432489 is 98423487.

It is not a de Polignac number, because 78432489 - 2¹¹ = 78430441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78432469) 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 15 ways as a sum of consecutive naturals, for example, 38257 + ... + 40254.

It is an arithmetic number, because the mean of its divisors is an integer number (7458640).

Almost surely, 2^78432489 is an apocalyptic number.

It is an amenable number.

78432489 is a deficient number, since it is larger than the sum of its proper divisors (40905751).

78432489 is a wasteful number, since it uses less digits than its factorization.

78432489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78557 (or 78551 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 78432489 is about 8856.2118877091. The cubic root of 78432489 is about 428.0541045091.

The spelling of 78432489 in words is "seventy-eight million, four hundred thirty-two thousand, four hundred eighty-nine".