78664059 has 12 divisors (see below), whose sum is σ = 114494952. Its totient is φ = 52041600.

The previous prime is 78664057. The next prime is 78664067. The reversal of 78664059 is 95046687.

It is not a de Polignac number, because 78664059 - 2¹ = 78664057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78664057) 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 11 ways as a sum of consecutive naturals, for example, 32182 + ... + 34539.

It is an arithmetic number, because the mean of its divisors is an integer number (9541246).

Almost surely, 2^78664059 is an apocalyptic number.

78664059 is a deficient number, since it is larger than the sum of its proper divisors (35830893).

78664059 is a wasteful number, since it uses less digits than its factorization.

78664059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66858 (or 66855 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 78664059 is about 8869.2761260432. The cubic root of 78664059 is about 428.4749636698.

The spelling of 78664059 in words is "seventy-eight million, six hundred sixty-four thousand, fifty-nine".