78664106 has 4 divisors (see below), whose sum is σ = 117996162. Its totient is φ = 39332052.

The previous prime is 78664093. The next prime is 78664111. The reversal of 78664106 is 60146687.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 69872881 + 8791225 = 8359^2 + 2965^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78664106.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 19666025 + ... + 19666028.

Almost surely, 2^78664106 is an apocalyptic number.

78664106 is a deficient number, since it is larger than the sum of its proper divisors (39332056).

78664106 is a wasteful number, since it uses less digits than its factorization.

78664106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39332055.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 78664106 is about 8869.2787756390. The cubic root of 78664106 is about 428.4750490045.

The spelling of 78664106 in words is "seventy-eight million, six hundred sixty-four thousand, one hundred six".