78384666 has 16 divisors (see below), whose sum is σ = 156881088. Its totient is φ = 26109600.

The previous prime is 78384659. The next prime is 78384701. The reversal of 78384666 is 66648387.

It is a happy number.

It is a super-2 number, since 2×78384666² = 12288311727863112, which contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 6531 + ... + 14121.

It is an arithmetic number, because the mean of its divisors is an integer number (9805068).

Almost surely, 2^78384666 is an apocalyptic number.

78384666 is an abundant number, since it is smaller than the sum of its proper divisors (78496422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78384666 is a wasteful number, since it uses less digits than its factorization.

78384666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9317.

The product of its digits is 1161216, while the sum is 48.

The square root of 78384666 is about 8853.5115067413. The cubic root of 78384666 is about 427.9670870257.

The spelling of 78384666 in words is "seventy-eight million, three hundred eighty-four thousand, six hundred sixty-six".