86671638 has 24 divisors (see below), whose sum is σ = 188477328. Its totient is φ = 28784592.

The previous prime is 86671631. The next prime is 86671639. The reversal of 86671638 is 83617668.

86671638 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 1 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 86671593 and 86671602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86671631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3706 + ... + 13677.

It is an arithmetic number, because the mean of its divisors is an integer number (7853222).

Almost surely, 2^86671638 is an apocalyptic number.

86671638 is an abundant number, since it is smaller than the sum of its proper divisors (101805690).

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

86671638 is a wasteful number, since it uses less digits than its factorization.

86671638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17668 (or 17665 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 86671638 is about 9309.7603621146. The cubic root of 86671638 is about 442.5465928148.

The spelling of 86671638 in words is "eighty-six million, six hundred seventy-one thousand, six hundred thirty-eight".