77840811 has 8 divisors (see below), whose sum is σ = 115319760. Its totient is φ = 51893856.

The previous prime is 77840767. The next prime is 77840839. The reversal of 77840811 is 11804877.

It is not a de Polignac number, because 77840811 - 2⁶ = 77840747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77840111) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1441470 + ... + 1441523.

It is an arithmetic number, because the mean of its divisors is an integer number (14414970).

Almost surely, 2^77840811 is an apocalyptic number.

77840811 is a deficient number, since it is larger than the sum of its proper divisors (37478949).

77840811 is a wasteful number, since it uses less digits than its factorization.

77840811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883002 (or 2882996 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 77840811 is about 8822.7439609228. The cubic root of 77840811 is about 426.9750034272.

The spelling of 77840811 in words is "seventy-seven million, eight hundred forty thousand, eight hundred eleven".