86778999 has 16 divisors (see below), whose sum is σ = 136124640. Its totient is φ = 54449280.

The previous prime is 86778997. The next prime is 86779009. The reversal of 86778999 is 99987768.

It is not a de Polignac number, because 86778999 - 2¹ = 86778997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86778997) 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 15 ways as a sum of consecutive naturals, for example, 94072 + ... + 94989.

It is an arithmetic number, because the mean of its divisors is an integer number (8507790).

Almost surely, 2^86778999 is an apocalyptic number.

86778999 is a deficient number, since it is larger than the sum of its proper divisors (49345641).

86778999 is a wasteful number, since it uses less digits than its factorization.

86778999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189087 (or 189081 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 86778999 is about 9315.5246229077. The cubic root of 86778999 is about 442.7292463386.

The spelling of 86778999 in words is "eighty-six million, seven hundred seventy-eight thousand, nine hundred ninety-nine".