86778818 has 16 divisors (see below), whose sum is σ = 148884480. Its totient is φ = 37160736.

The previous prime is 86778803. The next prime is 86778841. The reversal of 86778818 is 81887768.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 86778818.

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 7 ways as a sum of consecutive naturals, for example, 28703 + ... + 31581.

It is an arithmetic number, because the mean of its divisors is an integer number (9305280).

Almost surely, 2^86778818 is an apocalyptic number.

86778818 is a deficient number, since it is larger than the sum of its proper divisors (62105662).

86778818 is a wasteful number, since it uses less digits than its factorization.

86778818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041.

The product of its digits is 1204224, while the sum is 53.

The square root of 86778818 is about 9315.5149079372. The cubic root of 86778818 is about 442.7289385297.

The spelling of 86778818 in words is "eighty-six million, seven hundred seventy-eight thousand, eight hundred eighteen".