78191768 has 16 divisors (see below), whose sum is σ = 147131880. Its totient is φ = 38956608.

The previous prime is 78191761. The next prime is 78191777. The reversal of 78191768 is 86719187.

It is a super-2 number, since 2×78191768² = 12227905165931648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78191761) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15005 + ... + 19532.

Almost surely, 2^78191768 is an apocalyptic number.

It is an amenable number.

78191768 is a deficient number, since it is larger than the sum of its proper divisors (68940112).

78191768 is a wasteful number, since it uses less digits than its factorization.

78191768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34826 (or 34822 counting only the distinct ones).

The product of its digits is 169344, while the sum is 47.

The square root of 78191768 is about 8842.6109266438. The cubic root of 78191768 is about 427.6157351114.

The spelling of 78191768 in words is "seventy-eight million, one hundred ninety-one thousand, seven hundred sixty-eight".