78666196 has 12 divisors (see below), whose sum is σ = 157332448. Its totient is φ = 33714072.

The previous prime is 78666179. The next prime is 78666197. The reversal of 78666196 is 69166687.

78666196 is an admirable number.

It is a super-2 number, since 2×78666196² = 12376740786220832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78666197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1404726 + ... + 1404781.

Almost surely, 2^78666196 is an apocalyptic number.

It is an amenable number.

78666196 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78666196 is a wasteful number, since it uses less digits than its factorization.

78666196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2809518 (or 2809516 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The square root of 78666196 is about 8869.3965972889. The cubic root of 78666196 is about 428.4788436404.

The spelling of 78666196 in words is "seventy-eight million, six hundred sixty-six thousand, one hundred ninety-six".