86780786 has 8 divisors (see below), whose sum is σ = 131365740. Its totient is φ = 42992208.

The previous prime is 86780783. The next prime is 86780791. The reversal of 86780786 is 68708768.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 86025625 + 755161 = 9275^2 + 869^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (86780783) 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, 198821 + ... + 199256.

Almost surely, 2^86780786 is an apocalyptic number.

86780786 is a deficient number, since it is larger than the sum of its proper divisors (44584954).

86780786 is a wasteful number, since it uses less digits than its factorization.

86780786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398188.

The product of its (nonzero) digits is 903168, while the sum is 50.

The square root of 86780786 is about 9315.6205375702. The cubic root of 86780786 is about 442.7322852910.

The spelling of 86780786 in words is "eighty-six million, seven hundred eighty thousand, seven hundred eighty-six".