87643471 has 2 divisors, whose sum is σ = 87643472. Its totient is φ = 87643470.

The previous prime is 87643463. The next prime is 87643511. The reversal of 87643471 is 17434678.

It is an a-pointer prime, because the next prime (87643511) can be obtained adding 87643471 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87643471 - 2³ = 87643463 is a prime.

It is a super-3 number, since 3×87643471³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87643411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43821735 + 43821736.

It is an arithmetic number, because the mean of its divisors is an integer number (43821736).

Almost surely, 2^87643471 is an apocalyptic number.

87643471 is a deficient number, since it is larger than the sum of its proper divisors (1).

87643471 is an equidigital number, since it uses as much as digits as its factorization.

87643471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 40.

The square root of 87643471 is about 9361.8091734451. The cubic root of 87643471 is about 444.1945130874.

The spelling of 87643471 in words is "eighty-seven million, six hundred forty-three thousand, four hundred seventy-one".