80777709 has 16 divisors (see below), whose sum is σ = 119812800. Its totient is φ = 53787888.

The previous prime is 80777707. The next prime is 80777713. The reversal of 80777709 is 90777708.

It is not a de Polignac number, because 80777709 - 2¹ = 80777707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80777701) 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 15 ways as a sum of consecutive naturals, for example, 35982 + ... + 38160.

It is an arithmetic number, because the mean of its divisors is an integer number (7488300).

Almost surely, 2^80777709 is an apocalyptic number.

It is an amenable number.

80777709 is a deficient number, since it is larger than the sum of its proper divisors (39035091).

80777709 is a wasteful number, since it uses less digits than its factorization.

80777709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561 (or 3555 counting only the distinct ones).

The product of its (nonzero) digits is 172872, while the sum is 45.

The square root of 80777709 is about 8987.6420155678. The cubic root of 80777709 is about 432.2787071118.

Subtracting 80777709 from its reverse (90777708), we obtain a palindrome (9999999).

The spelling of 80777709 in words is "eighty million, seven hundred seventy-seven thousand, seven hundred nine".