86939778 has 8 divisors (see below), whose sum is σ = 173879568. Its totient is φ = 28979924.

The previous prime is 86939777. The next prime is 86939837. The reversal of 86939778 is 87793968.

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

86939778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (86939777) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7244976 + ... + 7244987.

It is an arithmetic number, because the mean of its divisors is an integer number (21734946).

Almost surely, 2^86939778 is an apocalyptic number.

86939778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86939778 is a wasteful number, since it uses less digits than its factorization.

86939778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14489968.

The product of its digits is 4572288, while the sum is 57.

The square root of 86939778 is about 9324.1502561896. The cubic root of 86939778 is about 443.0024985124.

The spelling of 86939778 in words is "eighty-six million, nine hundred thirty-nine thousand, seven hundred seventy-eight".