80777705 has 4 divisors (see below), whose sum is σ = 96933252. Its totient is φ = 64622160.

The previous prime is 80777701. The next prime is 80777707. The reversal of 80777705 is 50777708.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20187049 + 60590656 = 4493^2 + 7784^2 .

It is not a de Polignac number, because 80777705 - 2² = 80777701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80777701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8077766 + ... + 8077775.

It is an arithmetic number, because the mean of its divisors is an integer number (24233313).

Almost surely, 2^80777705 is an apocalyptic number.

It is an amenable number.

80777705 is a deficient number, since it is larger than the sum of its proper divisors (16155547).

80777705 is a wasteful number, since it uses less digits than its factorization.

80777705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16155546.

The product of its (nonzero) digits is 96040, while the sum is 41.

The square root of 80777705 is about 8987.6417930400. The cubic root of 80777705 is about 432.2786999765.

The spelling of 80777705 in words is "eighty million, seven hundred seventy-seven thousand, seven hundred five".