76856617 has 4 divisors (see below), whose sum is σ = 76947156. Its totient is φ = 76766080.

The previous prime is 76856603. The next prime is 76856627. The reversal of 76856617 is 71665867.

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 61716736 + 15139881 = 7856^2 + 3891^2 .

It is a cyclic number.

It is not a de Polignac number, because 76856617 - 2⁷ = 76856489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76856627) 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 3 ways as a sum of consecutive naturals, for example, 43984 + ... + 45697.

It is an arithmetic number, because the mean of its divisors is an integer number (19236789).

Almost surely, 2^76856617 is an apocalyptic number.

It is an amenable number.

76856617 is a deficient number, since it is larger than the sum of its proper divisors (90539).

76856617 is an equidigital number, since it uses as much as digits as its factorization.

76856617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90538.

The product of its digits is 423360, while the sum is 46.

The square root of 76856617 is about 8766.7905758037. The cubic root of 76856617 is about 425.1678543429.

The spelling of 76856617 in words is "seventy-six million, eight hundred fifty-six thousand, six hundred seventeen".