77220777 has 8 divisors (see below), whose sum is σ = 103003264. Its totient is φ = 51459408.

The previous prime is 77220757. The next prime is 77220791. The reversal of 77220777 is 77702277.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77220777 - 2⁶ = 77220713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77220757) 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, 8103 + ... + 14835.

It is an arithmetic number, because the mean of its divisors is an integer number (12875408).

Almost surely, 2^77220777 is an apocalyptic number.

It is an amenable number.

77220777 is a deficient number, since it is larger than the sum of its proper divisors (25782487).

77220777 is a wasteful number, since it uses less digits than its factorization.

77220777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10559.

The product of its (nonzero) digits is 67228, while the sum is 39.

The square root of 77220777 is about 8787.5353199859. The cubic root of 77220777 is about 425.8383029339.

The spelling of 77220777 in words is "seventy-seven million, two hundred twenty thousand, seven hundred seventy-seven".