80777755 has 4 divisors (see below), whose sum is σ = 96933312. Its totient is φ = 64622200.

The previous prime is 80777729. The next prime is 80777773. The reversal of 80777755 is 55777708.

It is a happy number.

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

It is not a de Polignac number, because 80777755 - 2²³ = 72389147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8077771 + ... + 8077780.

It is an arithmetic number, because the mean of its divisors is an integer number (24233328).

Almost surely, 2^80777755 is an apocalyptic number.

80777755 is a deficient number, since it is larger than the sum of its proper divisors (16155557).

80777755 is a wasteful number, since it uses less digits than its factorization.

80777755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16155556.

The product of its (nonzero) digits is 480200, while the sum is 46.

The square root of 80777755 is about 8987.6445746369. The cubic root of 80777755 is about 432.2787891675.

The spelling of 80777755 in words is "eighty million, seven hundred seventy-seven thousand, seven hundred fifty-five".