78166812 has 12 divisors (see below), whose sum is σ = 182389256. Its totient is φ = 26055600.

The previous prime is 78166793. The next prime is 78166871. The reversal of 78166812 is 21866187.

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

It is a super-2 number, since 2×78166812² = 12220100996486688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 3256939 + ... + 3256962.

Almost surely, 2^78166812 is an apocalyptic number.

It is an amenable number.

78166812 is an abundant number, since it is smaller than the sum of its proper divisors (104222444).

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

78166812 is a wasteful number, since it uses less digits than its factorization.

78166812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6513908 (or 6513906 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 78166812 is about 8841.1996923494. The cubic root of 78166812 is about 427.5702370831.

The spelling of 78166812 in words is "seventy-eight million, one hundred sixty-six thousand, eight hundred twelve".