86971638 has 32 divisors (see below), whose sum is σ = 193788000. Its totient is φ = 25837056.

The previous prime is 86971637. The next prime is 86971639. The reversal of 86971638 is 83617968.

It is an interprime number because it is at equal distance from previous prime (86971637) and next prime (86971639).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86971631) 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, 16963 + ... + 21486.

It is an arithmetic number, because the mean of its divisors is an integer number (6055875).

Almost surely, 2^86971638 is an apocalyptic number.

86971638 is an abundant number, since it is smaller than the sum of its proper divisors (106816362).

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

86971638 is a wasteful number, since it uses less digits than its factorization.

86971638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38496.

The product of its digits is 435456, while the sum is 48.

The square root of 86971638 is about 9325.8585663734. The cubic root of 86971638 is about 443.0566062185.

The spelling of 86971638 in words is "eighty-six million, nine hundred seventy-one thousand, six hundred thirty-eight".