77812006 has 4 divisors (see below), whose sum is σ = 116718012. Its totient is φ = 38906002.

The previous prime is 77812001. The next prime is 77812039. The reversal of 77812006 is 60021877.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60021877 = 307 ⋅195511.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77812001) 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 as a sum of consecutive naturals, namely, 19453000 + ... + 19453003.

It is an arithmetic number, because the mean of its divisors is an integer number (29179503).

Almost surely, 2^77812006 is an apocalyptic number.

77812006 is a deficient number, since it is larger than the sum of its proper divisors (38906006).

77812006 is a wasteful number, since it uses less digits than its factorization.

77812006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38906005.

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

The square root of 77812006 is about 8821.1113812263. Note that the first 3 decimals coincide. The cubic root of 77812006 is about 426.9223295482.

The spelling of 77812006 in words is "seventy-seven million, eight hundred twelve thousand, six".