77816851 has 12 divisors (see below), whose sum is σ = 93443520. Its totient is φ = 64547280.

The previous prime is 77816807. The next prime is 77816863. The reversal of 77816851 is 15861877.

It is not a de Polignac number, because 77816851 - 2¹⁹ = 77292563 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77816798 and 77816807.

It is not an unprimeable number, because it can be changed into a prime (77816801) 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 11 ways as a sum of consecutive naturals, for example, 24096 + ... + 27133.

It is an arithmetic number, because the mean of its divisors is an integer number (7786960).

Almost surely, 2^77816851 is an apocalyptic number.

77816851 is a deficient number, since it is larger than the sum of its proper divisors (15626669).

77816851 is a wasteful number, since it uses less digits than its factorization.

77816851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51274 (or 51267 counting only the distinct ones).

The product of its digits is 94080, while the sum is 43.

The square root of 77816851 is about 8821.3860022108. The cubic root of 77816851 is about 426.9311902021.

The spelling of 77816851 in words is "seventy-seven million, eight hundred sixteen thousand, eight hundred fifty-one".