78140668 has 6 divisors (see below), whose sum is σ = 136746176. Its totient is φ = 39070332.

The previous prime is 78140659. The next prime is 78140669. The reversal of 78140668 is 86604187.

It is a super-2 number, since 2×78140668² = 12211927990972448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78140668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78140669) 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 as a sum of consecutive naturals, namely, 9767580 + ... + 9767587.

Almost surely, 2^78140668 is an apocalyptic number.

It is an amenable number.

78140668 is a deficient number, since it is larger than the sum of its proper divisors (58605508).

78140668 is a wasteful number, since it uses less digits than its factorization.

78140668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19535171 (or 19535169 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 78140668 is about 8839.7210363224. The cubic root of 78140668 is about 427.5225627889.

The spelling of 78140668 in words is "seventy-eight million, one hundred forty thousand, six hundred sixty-eight".