78664116 has 12 divisors (see below), whose sum is σ = 183549632. Its totient is φ = 26221368.

The previous prime is 78664111. The next prime is 78664121. The reversal of 78664116 is 61146687.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78664111) and next prime (78664121).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78664116² = 12376086292122912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78664111) 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, 3277660 + ... + 3277683.

Almost surely, 2^78664116 is an apocalyptic number.

It is an amenable number.

78664116 is an abundant number, since it is smaller than the sum of its proper divisors (104885516).

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

78664116 is a wasteful number, since it uses less digits than its factorization.

78664116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6555350 (or 6555348 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 78664116 is about 8869.2793393827. The cubic root of 78664116 is about 428.4750671608.

The spelling of 78664116 in words is "seventy-eight million, six hundred sixty-four thousand, one hundred sixteen".