86618729 has 4 divisors (see below), whose sum is σ = 86648976. Its totient is φ = 86588484.

The previous prime is 86618687. The next prime is 86618761. The reversal of 86618729 is 92781668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86618729 - 2¹⁶ = 86553193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86618789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10319 + ... + 16724.

It is an arithmetic number, because the mean of its divisors is an integer number (21662244).

Almost surely, 2^86618729 is an apocalyptic number.

It is an amenable number.

86618729 is a deficient number, since it is larger than the sum of its proper divisors (30247).

86618729 is a wasteful number, since it uses less digits than its factorization.

86618729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30246.

The product of its digits is 290304, while the sum is 47.

The square root of 86618729 is about 9306.9183406754. The cubic root of 86618729 is about 442.4565231205.

The spelling of 86618729 in words is "eighty-six million, six hundred eighteen thousand, seven hundred twenty-nine".