77680012 has 6 divisors (see below), whose sum is σ = 135940028. Its totient is φ = 38840004.

The previous prime is 77680003. The next prime is 77680051. The reversal of 77680012 is 21008677.

It is a happy 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, 9709998 + ... + 9710005.

Almost surely, 2^77680012 is an apocalyptic number.

It is an amenable number.

77680012 is a deficient number, since it is larger than the sum of its proper divisors (58260016).

77680012 is a wasteful number, since it uses less digits than its factorization.

77680012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19420007 (or 19420005 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 77680012 is about 8813.6264953763. The cubic root of 77680012 is about 426.6807940743.

Adding to 77680012 its reverse (21008677), we get a palindrome (98688689).

The spelling of 77680012 in words is "seventy-seven million, six hundred eighty thousand, twelve".