87765256778 has 32 divisors (see below), whose sum is σ = 134345502720. Its totient is φ = 42994748160.

The previous prime is 87765256753. The next prime is 87765256793.

87765256778 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8605250 + ... + 8615442.

It is an arithmetic number, because the mean of its divisors is an integer number (4198296960).

Almost surely, 2^87765256778 is an apocalyptic number.

87765256778 is a deficient number, since it is larger than the sum of its proper divisors (46580245942).

87765256778 is a wasteful number, since it uses less digits than its factorization.

87765256778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10742.

The product of its digits is 276595200, while the sum is 68.

The spelling of 87765256778 in words is "eighty-seven billion, seven hundred sixty-five million, two hundred fifty-six thousand, seven hundred seventy-eight".