86891729 has 4 divisors (see below), whose sum is σ = 89694720. Its totient is φ = 84088740.

The previous prime is 86891711. The next prime is 86891737. The reversal of 86891729 is 92719868.

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 not a de Polignac number, because 86891729 - 2¹⁶ = 86826193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86891759) 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, 1401449 + ... + 1401510.

It is an arithmetic number, because the mean of its divisors is an integer number (22423680).

Almost surely, 2^86891729 is an apocalyptic number.

It is an amenable number.

86891729 is a deficient number, since it is larger than the sum of its proper divisors (2802991).

86891729 is a wasteful number, since it uses less digits than its factorization.

86891729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802990.

The product of its digits is 435456, while the sum is 50.

The square root of 86891729 is about 9321.5733114105. The cubic root of 86891729 is about 442.9208720882.

The spelling of 86891729 in words is "eighty-six million, eight hundred ninety-one thousand, seven hundred twenty-nine".