86870639 has 2 divisors, whose sum is σ = 86870640. Its totient is φ = 86870638.

The previous prime is 86870611. The next prime is 86870653. The reversal of 86870639 is 93607868.

86870639 is nontrivially palindromic in base 9.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86870639 - 2⁸ = 86870383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 86870593 and 86870602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86870239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43435319 + 43435320.

It is an arithmetic number, because the mean of its divisors is an integer number (43435320).

Almost surely, 2^86870639 is an apocalyptic number.

86870639 is a deficient number, since it is larger than the sum of its proper divisors (1).

86870639 is an equidigital number, since it uses as much as digits as its factorization.

86870639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 86870639 is about 9320.4419959571. The cubic root of 86870639 is about 442.8850345497.

The spelling of 86870639 in words is "eighty-six million, eight hundred seventy thousand, six hundred thirty-nine".