78218012 has 6 divisors (see below), whose sum is σ = 136881528. Its totient is φ = 39109004.

The previous prime is 78217999. The next prime is 78218027. The reversal of 78218012 is 21081287.

It is a super-2 number, since 2×78218012² = 12236114802464288, 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9777248 + ... + 9777255.

It is an arithmetic number, because the mean of its divisors is an integer number (22813588).

Almost surely, 2^78218012 is an apocalyptic number.

It is an amenable number.

78218012 is a deficient number, since it is larger than the sum of its proper divisors (58663516).

78218012 is a wasteful number, since it uses less digits than its factorization.

78218012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19554507 (or 19554505 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 78218012 is about 8844.0947529976. The cubic root of 78218012 is about 427.6635708889.

Adding to 78218012 its reverse (21081287), we get a palindrome (99299299).

The spelling of 78218012 in words is "seventy-eight million, two hundred eighteen thousand, twelve".