86216409 has 6 divisors (see below), whose sum is σ = 124534826. Its totient is φ = 57477600.

The previous prime is 86216407. The next prime is 86216447. The reversal of 86216409 is 90461268.

86216409 is a `hidden beast` number, since 8 + 6 + 2 + 1 + 640 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 86211225 + 5184 = 9285^2 + 72^2 .

It is not a de Polignac number, because 86216409 - 2¹ = 86216407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86216407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4789792 + ... + 4789809.

Almost surely, 2^86216409 is an apocalyptic number.

It is an amenable number.

86216409 is a deficient number, since it is larger than the sum of its proper divisors (38318417).

86216409 is a wasteful number, since it uses less digits than its factorization.

86216409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9579607 (or 9579604 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 86216409 is about 9285.2791557389. The cubic root of 86216409 is about 441.7704304598.

It can be divided in two parts, 862 and 16409, that added together give a palindrome (17271).

The spelling of 86216409 in words is "eighty-six million, two hundred sixteen thousand, four hundred nine".