86687429 has 4 divisors (see below), whose sum is σ = 86706060. Its totient is φ = 86668800.

The previous prime is 86687401. The next prime is 86687431. The reversal of 86687429 is 92478668.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 80586529 + 6100900 = 8977^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 86687429 - 2⁸ = 86687173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86687449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4229 + ... + 13829.

It is an arithmetic number, because the mean of its divisors is an integer number (21676515).

Almost surely, 2^86687429 is an apocalyptic number.

It is an amenable number.

86687429 is a deficient number, since it is larger than the sum of its proper divisors (18631).

86687429 is an equidigital number, since it uses as much as digits as its factorization.

86687429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18630.

The product of its digits is 1161216, while the sum is 50.

The square root of 86687429 is about 9310.6084119138. The cubic root of 86687429 is about 442.5734675382.

The spelling of 86687429 in words is "eighty-six million, six hundred eighty-seven thousand, four hundred twenty-nine".