78133666 has 32 divisors (see below), whose sum is σ = 136781568. Its totient is φ = 33143040.

The previous prime is 78133651. The next prime is 78133673. The reversal of 78133666 is 66633187.

It is a super-2 number, since 2×78133666² = 12209739525199112, 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 15 ways as a sum of consecutive naturals, for example, 16951 + ... + 21061.

It is an arithmetic number, because the mean of its divisors is an integer number (4274424).

Almost surely, 2^78133666 is an apocalyptic number.

78133666 is a deficient number, since it is larger than the sum of its proper divisors (58647902).

78133666 is a wasteful number, since it uses less digits than its factorization.

78133666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4186.

The product of its digits is 108864, while the sum is 40.

The square root of 78133666 is about 8839.3249742274. The cubic root of 78133666 is about 427.5097926464.

The spelling of 78133666 in words is "seventy-eight million, one hundred thirty-three thousand, six hundred sixty-six".