86831729 has 8 divisors (see below), whose sum is σ = 91500000. Its totient is φ = 82173312.

The previous prime is 86831707. The next prime is 86831737. The reversal of 86831729 is 92713868.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 86831729 - 2¹² = 86827633 is a prime.

It is a super-2 number, since 2×86831729² = 15079498322258882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86831729.

It is not an unprimeable number, because it can be changed into a prime (86831779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21902 + ... + 25560.

It is an arithmetic number, because the mean of its divisors is an integer number (11437500).

Almost surely, 2^86831729 is an apocalyptic number.

It is an amenable number.

86831729 is a deficient number, since it is larger than the sum of its proper divisors (4668271).

86831729 is a wasteful number, since it uses less digits than its factorization.

86831729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4927.

The product of its digits is 145152, while the sum is 44.

The square root of 86831729 is about 9318.3544148095. The cubic root of 86831729 is about 442.8189008502.

The spelling of 86831729 in words is "eighty-six million, eight hundred thirty-one thousand, seven hundred twenty-nine".