86778447 has 16 divisors (see below), whose sum is σ = 132549120. Its totient is φ = 49469472.

The previous prime is 86778389. The next prime is 86778449. The reversal of 86778447 is 74487768.

It is not a de Polignac number, because 86778447 - 2⁸ = 86778191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86778447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86778449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4513 + ... + 13925.

It is an arithmetic number, because the mean of its divisors is an integer number (8284320).

Almost surely, 2^86778447 is an apocalyptic number.

86778447 is a deficient number, since it is larger than the sum of its proper divisors (45770673).

86778447 is a wasteful number, since it uses less digits than its factorization.

86778447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9862.

The product of its digits is 2107392, while the sum is 51.

The square root of 86778447 is about 9315.4949948996. The cubic root of 86778447 is about 442.7283076051.

The spelling of 86778447 in words is "eighty-six million, seven hundred seventy-eight thousand, four hundred forty-seven".